Devotion to Green — Pioneer Strategy Guide

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Archetype Overview

Devotion to Green is a mono-green ramp deck that turns permanents into mana. Every green symbol you put on the battlefield makes Nykthos, Shrine to Nyx produce more, and the deck is built so that almost every card adds devotion, generates extra mana, or cashes that mana in for card advantage. The list below won an MTGO Challenge 32 on 2026-10-19 (46 players, played by MTGO user MandrillMan). Its plan is simple to state: go wider on mana than anything else at the table, then convert that mana into a board the opponent can't keep up with.

The Engine

The deck runs three layers of acceleration.

• Mana creatures. Seven one-drops, Llanowar Elves and Elvish Mystic, each add mana and a point of devotion on turn one.
• Devotion stacking. Leyline of the Guildpact is the standout. Its cost is four hybrid symbols, each containing green, so it counts as four devotion to green. If it's in your opening hand, it starts on the battlefield for free. Old-Growth Troll and Cavalier of Thorns add three each, Garruk, Curse Breaker and Ulvenwald Oddity add two, and even the cheap plays (Invasion of Ixalan, Outcaster Trailblazer, Kiora, Behemoth Beckoner) add one.
• The payoff land. Nykthos, Shrine to Nyx costs {2} to activate and returns mana equal to your devotion.

Two cards make Nykthos better than it is in a normal devotion shell:

• Sunken Citadel taps for two mana that can only be spent on land abilities, and Nykthos's activation is exactly that. One Citadel pays the whole activation cost.
• Kiora, Behemoth Beckoner can −1 to untap Nykthos for a second activation. She starts at seven loyalty, so she can do it turn after turn. Garruk, Curse Breaker does the same with his +2, untapping up to two lands while gaining loyalty.

Here is how fast it gets:

1. Start with Leyline on the battlefield (four devotion).
2. Turn one: Forest, then an Elf (five devotion).
3. Turn two: play Nykthos, pay {2} with the Forest and the Elf, and tap Nykthos for five green.

That puts a five-drop on the battlefield on turn two.

Turning Mana Into Cards

Ramp decks lose when they draw lands and nothing to spend them on. This list avoids that with overlapping draw engines that all key off the same condition, a creature with power 4 or greater entering:

• Kiora, Behemoth Beckoner
• Garruk, Curse Breaker
• Outcaster Trailblazer, which triggers on other creatures

Nearly every creature in the deck meets that condition. Old-Growth Troll, Ulvenwald Oddity, Outcaster Trailblazer, Vibrance, and Belligerent Regisaur (the back face of Invasion of Ixalan) are all power 4. Cavalier of Thorns is power 5. Garruk's −3 makes a 4/4 Beast token, which triggers his own draw ability. With one engine down, each threat replaces itself. With two down, each threat draws two cards.

Storm the Festival ties the deck together. It puts two permanents with mana value 5 or less from the top five cards straight onto the battlefield. Nearly the entire nonland deck qualifies, and lands are permanents too. Every creature put in that way triggers your draw engines. Its flashback costs ten mana, which is a real option once Nykthos is online.

Why the Plan Holds Up

• Redundancy. Losing an early dork doesn't stop your mana development: Cavalier of Thorns puts a land onto the battlefield, and Vibrance cast with {G}{G} fetches a land and gains 2 life. Invasion of Ixalan digs for whichever piece you're missing.
• Resilient threats. Old-Growth Troll returns as an Aura when it dies. It still counts as {G}{G}{G} of devotion, and the enchanted land taps for {G}{G}. Leyline of the Guildpact makes all your lands every basic land type, so the Troll can enchant Nykthos itself. Cavalier of Thorns dying lets you put another card from your graveyard back on top of your library. Its enter trigger fills that graveyard first, so you'll usually have a good target.
• Mana sinks. Flood is rarely dead. Lair of the Hydra becomes an X/X Hydra creature, and Citadel mana can pay for that activation. Ulvenwald Oddity transforms for seven into an 8/8 that gives your team +1/+1, trample, and haste.
• Interaction from the land slots. Boseiju, Who Endures answers an artifact, enchantment, or nonbasic land without costing you a spell slot.

The cost is that interaction is thin. Your main deck answers to opposing threats amount to two copies of Boseiju, so in game one you are racing. The sideboard adds ways to go bigger or to answer specific problems, but the deck's identity stays proactive.

Who Should Pick It Up

Pick this deck if you like counting. The skill ceiling is in sequencing mana:

• when to activate Nykthos versus casting another devotion piece first
• which planeswalker to use for untapping
• how to order threats so each one draws the maximum number of cards

Small errors cost you a turn, and correct lines produce some of the most explosive turns available to a fair deck.

Skip it if you want to win by reacting. You will rarely hold up interaction, and against fast starts you have to trust that your board catches up. At an estimated $461 (TCGplayer market prices, approximate), it's a mid-priced build to assemble. The engine is all mono-green, which makes it a long-term investment you can keep tuning.

Core Strategy & Game Plan

How the Deck Wins

You win by turning green mana symbols into an absurd amount of mana, then converting that mana into a board the opponent can't block through. The kill usually comes from one of three places. The first is Ulvenwald Oddity transforming into an 8/8 that gives your team +1/+1, trample and haste. The second is Garruk, Curse Breaker using its −4 to give every attacker +2/+2 and trample. The third is Lair of the Hydra becoming an X/X once you have mana to spare. Everything before that is setup: build devotion, untap Nykthos, Shrine to Nyx, and draw cards off a stream of 4-power bodies.

Posture: Proactive, Almost Entirely

Your main-deck interaction is two Boseiju, Who Endures and the reach on Cavalier of Thorns. You are not trying to answer the opponent's plan. You are presenting threats faster and bigger than they can handle, and making every piece of their interaction trade with one card out of a hand that keeps refilling. When you have to choose between a defensive play and a play that advances your mana, advance the mana. The exception is when the opponent's clock gets there before your engine pays off. In that case Cavalier of Thorns and a 4/4 Old-Growth Troll are your walls, and you deploy them as blockers first.

The Engine

Devotion. Your devotion comes from these permanents:

• Leyline of the Guildpact: four hybrid symbols, all of which count as green. Free from your opening hand, so it can be on the battlefield before turn 1.
• Old-Growth Troll and Cavalier of Thorns: three each.
• Llanowar Elves and Elvish Mystic: one each. They also ramp you a full turn.

Old-Growth Troll is especially sticky. When it dies it returns as an Aura with the same mana cost, so killing it doesn't cost you devotion. It also upgrades a Forest to tap for {G}{G}. With Leyline of the Guildpact out, every land you control is a Forest, so any land can carry it.

Nykthos math. Nykthos, Shrine to Nyx costs {2} to activate, so its net output is your devotion minus two. Sunken Citadel removes that tax. Its two-mana mode can only pay for abilities of land sources, which is exactly what the Nykthos activation and Lair of the Hydra need. Set the Citadel to green, play it early since it enters tapped, and let it pay for Nykthos so Nykthos's full output goes toward spells.

Untap effects. Kiora, Behemoth Beckoner −1 untaps Nykthos for a second activation, and she starts at 7 loyalty, so she can do it repeatedly. Garruk, Curse Breaker +2 untaps two lands, which can be Nykthos and the Citadel. This is where turns go from "a lot of mana" to "flash back Storm the Festival and transform Oddity in the same turn."

Card draw. Kiora, Behemoth Beckoner, Garruk, Curse Breaker and Outcaster Trailblazer each draw whenever a creature with power 4 or greater enters under your control. Most of your creatures qualify:

• Cavalier of Thorns, Old-Growth Troll, Ulvenwald Oddity, Vibrance, and the Trailblazer itself
• Belligerent Regisaur, the back face of Invasion of Ixalan once you defeat the battle
• Garruk's 4/4 Beast token and the Troll's 4/4 token

Stack two draw engines and every threat replaces itself twice.

Storm the Festival. Storm the Festival puts up to two permanents with mana value 5 or less straight onto the battlefield. That covers both planeswalkers, every creature in the main deck, Leyline of the Guildpact, and lands, including Nykthos. Creatures put onto the battlefield this way still trigger your draw engines. Vibrance won't get its mana-spent triggers this way, but it is still a 4-power body. The flashback cost of {7}{G}{G}{G} is a real late-game plan once Nykthos is producing double digits. Cavalier of Thorns dying lets you put a spent Storm back on top of your library. Invasion of Ixalan digs five cards deep for whichever piece you're missing.

The Ideal Game

1. Before turn 1: Leyline of the Guildpact from your opening hand.
2. Turn 1: Forest, Llanowar Elves or Elvish Mystic. Without a dork, a tapped Sunken Citadel is the best land to play.
3. Turn 2: Old-Growth Troll off the dork. Kiora, Behemoth Beckoner is the alternative when you already have devotion and want the draw engine in place first. Invasion of Ixalan is the fallback when your hand lacks threats.
4. Turn 3: Nykthos, Shrine to Nyx. With Leyline, a dork and Troll out, a single activation casts Storm the Festival with mana left over. Without Leyline, it still casts Cavalier of Thorns or Garruk, Curse Breaker on turn 3.
5. Turn 4 onward: Untap Nykthos with Kiora or Garruk and sink the surplus into transforming Ulvenwald Oddity, activating Lair of the Hydra, or flashing back Storm. Attack with a hasty, trampling board.

When the Ideal Game Doesn't Happen

Spend your early turns in this order of priority:

1. Devotion on board. A hand with Nykthos and no green permanents is a hand of lands.
2. A draw engine. Kiora or the Trailblazer before your first big creature means the creature draws a card.
3. Raw threats. If the opponent is removing your dorks, stop investing in Nykthos and cast 4/4s on curve. Old-Growth Troll and Ulvenwald Oddity both win games without the engine ever turning on. Outcaster Trailblazer can be plotted on a turn you'd otherwise waste and cast for free later alongside another threat.

Card Choices & Breakdown

Mana Acceleration: The One-Drops

4x Llanowar Elves, 3x Elvish Mystic. Seven functionally identical one-drops. Each one ramps you a turn and adds a point of green devotion for Nykthos, Shrine to Nyx. Turn-one dork into turn-two Troll or Leyline is the opening the rest of the list is built around. The seventh copy is the cut: 7 keeps the opener dense without flooding late on 1/1s that do nothing once Nykthos is online, and the eighth slot pays for the third Outcaster Trailblazer.

The Manabase: 21 Lands, Most of Them Doing Work

• 4x Nykthos, Shrine to Nyx: The engine. Pay {2}, tap, and get green mana equal to your devotion. Everything else in the deck either adds devotion or spends what Nykthos makes.
• 4x Sunken Citadel: Enters tapped, but its two-mana mode can only be spent on abilities of land sources. That restriction costs you almost nothing here. Two Citadel mana pays Nykthos's {2} activation by itself, and the rest goes into Lair of the Hydra's X or the Forest your Old-Growth Troll has enchanted.
• 2x Lair of the Hydra: A land that turns a big Nykthos activation into an X/X attacker. It enters tapped once you control two other lands, so play it early. Two copies keeps that tapped-land cost manageable.
• 2x Boseiju, Who Endures: An untapped green source that doubles as your main-deck answer to artifacts, enchantments, and nonbasic lands. You lose nothing by running it over a Forest.
• 9x Forest: The count matters for Old-Growth Troll, whose death trigger needs a Forest you control to enchant.

Devotion Payoffs and Threats

4x Old-Growth Troll: Three green pips on a 4/4 trampler. When it dies, it comes back as an Aura on a Forest. That Forest taps for {G}{G} and can sacrifice itself to make a 4/4 trample token. The returned Aura still has the {G}{G}{G} mana cost, so your Nykthos count doesn't drop when the creature dies. Removal on Troll trades one card for a fraction of its value.

4x Cavalier of Thorns: Another three pips, a 5/6 reach blocker that walls ground and air attackers, and a land drop off the top five. The other four cards go to your graveyard, which feeds the Cavalier's own death trigger. When it dies, you can exile it to put any card from your graveyard on top of your library, letting you set up a Storm the Festival or Garruk, Curse Breaker.

2x Ulvenwald Oddity: Haste and trample on a 4/4 gives you a threat that ignores sorcery-speed answers. The {5}{G}{G} transform is a Nykthos mana sink. Ulvenwald Behemoth gives your whole board +1/+1, trample, and haste, which ends games. It's a two-of because it's a finisher, not an engine piece.

3x Outcaster Trailblazer: The enters trigger refunds a mana, so it effectively costs two. It draws a card whenever another creature with power 4 or greater enters, and nearly every creature in the deck qualifies. Plot lets you pay for it on an idle turn and cast it free later, which doubles up with a big Nykthos turn. The fourth copy is in the sideboard because the 4/2 body is fragile against cheap removal and burn.

1x Vibrance: Cast normally with {G}{G}, it finds a land and gains 2 life. Evoked, it does the same for two mana. Note that Leyline of the Guildpact gives your lands every basic land type, so with it out your lands can tap for red. That lets you spend {R}{R} on Vibrance for the 3 damage, and if you spend both {R}{R} and {G}{G} across the cost, you get both triggers. It's a one-of because it's a flexible utility creature, not a core piece.

Card Advantage Engines

4x Kiora, Behemoth Beckoner: Draws on every 4-power creature, and with 7 starting loyalty her −1 can untap Nykthos, Shrine to Nyx for a second devotion burst. Opponents have to attack her or face a stream of cards and double Nykthos activations. Her hybrid symbol also counts toward green devotion.

2x Garruk, Curse Breaker: Its +2 untaps two lands, which means Nykthos twice. Its −3 makes a 4/4 that triggers Kiora and Trailblazer, and its −4 gives your attacking creatures +2/+2 and trample to close the game. At five mana it's top end, and a third copy would clog opening hands.

4x Leyline of the Guildpact: All four hybrid symbols include green, so it's four devotion. In your opening hand, it starts the game on the battlefield for free. Making every land every basic type also turns each of your lands into a legal target for Old-Growth Troll's Aura. Drawn later, it's a four-mana devotion boost you'll still often cast.

Selection and Digging

4x Invasion of Ixalan: Two mana to see five cards and take a permanent. It finds Nykthos, a planeswalker, or a payoff, and it adds a pip of devotion. If you defeat the battle, the 4/3 trampler on the back is cast, so it triggers your draw engines when it enters.

4x Storm the Festival: Six mana for two permanents with mana value 5 or less, put straight onto the battlefield. Nearly every hit counts: Cavalier, Troll, Kiora, Garruk, Leyline, and lands including Nykthos. Creatures that enter this way trigger Kiora and Trailblazer. The ten-mana flashback is realistic once Nykthos is reading high, so treat a Storm in your graveyard as a second copy waiting to be cast.

What the List Isn't Playing

Outside Boseiju, Who Endures and the occasional Vibrance shot, the main deck has no interaction. That's deliberate. Every slot either ramps, adds devotion, draws, or converts mana into board presence. Your defense is reach and toughness: Cavalier's 5/6 frame, Troll's recursion, and Vibrance's life. Dedicated answers stay in the sideboard.

The Decklist

This is the exact 60 and 15 that MandrillMan used to take 1st place at the MTGO Challenge 32 on 2026-10-19 (46 players). The list runs 21 lands and seven mana creatures, so you have 28 mana sources before counting Storm the Festival and Cavalier of Thorns. Estimated cost is about $461 at TCGplayer market prices (approximate). Notes marked Flex are the slots you can reasonably tune. Everything else is the engine.

Main Deck (60)

Sideboard (15)

The board leans on cards that punish spell-heavy decks and racing strategies. That is a sensible lean in a field where UR Aggro held 15 of 48 Top 8 slots (source: MTGTop8, 2026-10-01 to 2026-10-15). If your local field skews toward slower decks, the singleton Emrakul, the Promised End and Cityscape Leveler slots are where you have room to expand.

Mulligan Guide

What a Keepable Hand Looks Like

This deck wins by reaching a big Nykthos, Shrine to Nyx activation or a five- or six-drop well ahead of schedule. A keepable seven needs three things:

• Two or more lands, at least one of which makes green on turn one. Nykthos, Shrine to Nyx taps for colorless on its own, and Sunken Citadel enters tapped. Neither one alone is your opening green source.
• An accelerant or a devotion engine. That means Llanowar Elves, Elvish Mystic, or Leyline of the Guildpact. Leyline starts on the battlefield for free, and its four hybrid symbols each count toward devotion to green.
• Something to spend the mana on. Old-Growth Troll, Cavalier of Thorns, Storm the Festival, or a card-draw engine like Kiora, Behemoth Beckoner all count.

Hands with all three are keeps. Hands missing the accelerant can still be kept if the land count and curve are clean. Hands missing lands almost never can, because seven mana creatures do not cover a missing Forest.

A key Sunken Citadel detail: its two-mana ability pays for abilities of land sources. That includes the {2} on Nykthos, Shrine to Nyx and the hydra activation on Lair of the Hydra. Citadel plus Nykthos in the same hand is a strong pairing even without dorks.

Example Hands

Hand 1: Forest, Forest, Nykthos, Shrine to Nyx, Llanowar Elves, Old-Growth Troll, Kiora, Behemoth Beckoner, Invasion of Ixalan
Verdict: Snap keep.

• Turn one: Elves.
• Turn two: Troll off two Forests plus Elves, putting you at four devotion.
• Turn three: play Nykthos and pay its {2} with the Forests. It makes four green, and Elves adds a fifth. That covers Kiora, Behemoth Beckoner plus Invasion of Ixalan.

This is the deck's ideal shape.

Hand 2: Leyline of the Guildpact, Forest, Nykthos, Shrine to Nyx, Sunken Citadel, Elvish Mystic, Cavalier of Thorns, Storm the Festival
Verdict: Keep, and expect to win fast.

• Leyline starts in play.
• Turn one: Forest, Mystic. You are now at five devotion.
• Turn two: Nykthos, paid with Forest and Mystic, makes five green for a turn-two Cavalier of Thorns.
• Turn three: Citadel. From here Storm the Festival is close.

Leyline hands are the best draws in the deck. Value them accordingly.

Hand 3: Nykthos, Shrine to Nyx, Lair of the Hydra, Cavalier of Thorns, Garruk, Curse Breaker, Storm the Festival, Ulvenwald Oddity, Vibrance
Verdict: Ship.

• It has two lands but only one green source and zero devotion.
• Nothing costs less than four, so Nykthos is a colorless land until turn four at best.
• The cards are powerful, but this hand does nothing for three turns. You need to draw lands and dorks just to function.

Hand 4: Forest, Llanowar Elves, Elvish Mystic, Old-Growth Troll, Outcaster Trailblazer, Invasion of Ixalan, Kiora, Behemoth Beckoner
Verdict: Ship on the play. Keep on the draw against slower decks.

• The turn-two Troll is real, but it needs both dorks to survive and a second land to follow.
• On the draw you see an extra card to find that land.
• Outcaster Trailblazer's mana on entry and Invasion of Ixalan's dig help you recover.
• Against decks built around cheap removal, ship it regardless.

Hand 5: Forest, Forest, Lair of the Hydra, Sunken Citadel, Boseiju, Who Endures, Nykthos, Shrine to Nyx, Cavalier of Thorns
Verdict: Ship.

• Six lands and one spell, with no devotion to make Nykthos matter.
• Lair of the Hydra gives flood some use, but this hand casts one threat on turn five and hopes.
• A six-card hand with a dork and a payoff is better.

On the Play vs. On the Draw

On the play, your edge is tempo. Prioritize hands that put a dork or Leyline down immediately. Be stricter about one-landers, since you have one fewer draw to fix them.

On the draw, you can loosen up:

• Keep the occasional two-dork one-lander against non-aggressive opponents.
• Keep top-heavy hands with three lands but no accelerant.
• Count the extra draw as roughly one land you don't have yet.

Matchup Adjustments

UR Aggro. This is the archetype you should expect most. It took 15 of 48 Top 8 slots in the brief's sample (source: MTGTop8, 2026-10-01 to 2026-10-15).

• Dorks are fragile here, so don't keep hands that need two of them to survive.
• Value hands that land a four-power body early, especially Old-Growth Troll, which comes back as an Aura when it dies.
• Kiora, Behemoth Beckoner at seven loyalty buys time.
• Pure ramp-into-Storm the Festival hands with no early board are risky. Ship them more readily on the draw, where you are already behind.

Jund Sacrifice and The Rock. These are grindier midrange matchups, so card quality matters more than raw speed.

• Hands with Invasion of Ixalan, Kiora, Behemoth Beckoner, or Garruk, Curse Breaker alongside a reasonable curve are keeps even without a turn-one dork.
• Old-Growth Troll and Cavalier of Thorns both leave value behind when they die, so slower hands built on them are fine.

Control (Izzet Control, Dimir decks).

• Leyline of the Guildpact starts on the battlefield and is never cast, so it can't be countered. Leyline hands go up in value here.
• Prefer hands that pressure with several mid-sized threats over hands that funnel everything into one big Storm the Festival.
• Land-heavy hands are more forgivable here than anywhere else, as long as they hold two or more threats.

Combo (Lotus Field and similar).

• Keep for speed above all.
• A hand with Boseiju, Who Endures has a way to hit a key nonbasic land, artifact, or enchantment, which adds a little value.
• Slow, clunky sevens should go back.

After sideboarding, apply the same checklist: green source, accelerant, payoff. Count cheap sideboard creatures like Setessan Petitioner and Scrapshooter as early plays rather than as payoffs.

Sequencing & Key Lines

Turns 0–2: Lands First, Devotion Second

If Leyline of the Guildpact is in your opener, it goes onto the battlefield every time. It starts you at four green devotion before your first land drop, and it turns every land you control into every basic land type. Two things follow from that. Every land can pay for anything, and every land is a Forest, which matters for where Old-Growth Troll can land as an Aura.

Land order matters more than it looks:

• Lair of the Hydra goes down as land one or two. After that it enters tapped.
• Sunken Citadel always enters tapped, so play it on turn 1 when you have no dork, or on the turn you have spare mana. Choose green almost every time.
• Nykthos, Shrine to Nyx wants to be your turn 2 or 3 land, the turn you have devotion to cash in.
• Boseiju, Who Endures is your last land drop if you have a choice. It is worth more in hand as an answer.

The Nykthos Turn: Worked Lines

Leyline opener: On turn 1, play Forest and Llanowar Elves, which puts you at five devotion. On turn 2, play Nykthos. Forest and Elves pay the {2}, and Nykthos adds five green. That is a turn-2 Cavalier of Thorns or Garruk, Curse Breaker.

Citadel opener:

1. Turn 1: Sunken Citadel, set to green.
2. Turn 2: Forest. Cast Elves off the Forest and Elvish Mystic off the Citadel's normal mana.
3. Turn 3: Nykthos. Forest and both dorks cast Old-Growth Troll, bringing devotion to five. Citadel's restricted two mana pays Nykthos's {2} by itself, and Nykthos adds five more for Cavalier.

The core edge is that Citadel's restricted mana only works on abilities of land sources. Nykthos activation is the best use of that mana. Lair's {X}{G} and Boseiju's channel come next.

Without Citadel help, Nykthos only nets mana at three or more devotion, since you pay {2} from other sources. Don't crack it for less unless you're converting mana you couldn't otherwise spend.

Big Turns: Engines Before Bodies

Kiora, Behemoth Beckoner, Garruk, Curse Breaker and Outcaster Trailblazer each draw a card whenever a power-4-or-greater creature enters. Land the engine first, then the bodies.

• Kiora's −1 on Nykthos. Activate Nykthos, untap it with Kiora, then activate it again for another {2}.
• Garruk's +2 on Nykthos and Citadel. Untapping both gives you a second full devotion activation that costs you nothing extra. Run both walkers in one turn and Nykthos fires three times.
• Trailblazer refunds itself. It adds one mana when it enters, so it costs you two net. It also triggers Kiora and Garruk, because they draw off "a creature," not "another creature."
• Tokens trigger draws. The Troll token from the Aura and Garruk's −3 Beast both enter as 4/4s, so they draw with every engine you have out.
• Lair does not trigger draws. Animating it doesn't make it enter. Save Lair for the end of the turn as your mana sink.
• Oddity is the other sink. If you still have seven left over after your threats, transform Ulvenwald Oddity.

Branch Points

• Invasion of Ixalan can take any permanent card, and lands count. If you're missing Nykthos, it is usually the pick over another creature.
• Storm the Festival also hits lands and Leyline of the Guildpact. Pick by priority:
  • Take an engine plus a 4-power creature. Permanents entering together see each other, so Kiora or Garruk draws off a Cavalier that enters alongside it.
  • Never take Vibrance off Storm. No mana was spent to cast it, so neither enter trigger happens.
• Cavalier of Thorns mills the four cards it doesn't put onto the battlefield. If a Storm the Festival goes to the graveyard, you can flash it back later. When Cavalier dies, you can also exile it to put that Storm back on top of your library.
• Troll Aura placement. With Leyline out, put the returning Aura on Sunken Citadel. Its new "{T}: Add {G}{G}" isn't restricted, which makes Citadel a real double land. Without Leyline, it needs a basic Forest. Make sure you still control one before you trade Troll off.
• Vibrance's mode. Leyline makes every land a Mountain too. Paying {R}{R}{G}{G} plus one meets both conditions, so you get 3 damage and a land.

Playing Around Interaction

UR Aggro is the deck you'll see most. It took 15 of 48 Top 8 slots across the counted events (source: MTGTop8, 2026-10-01 to 2026-10-15). Its sideboard flex leaned on Spell Pierce and It'll Quench Ya!, each in 13 of the 15 lists (source: MTGTop8 deck exports, 2026-10-01 to 2026-10-15).

• Bait with lower-impact threats. Your dorks and early creatures draw out their cheap answers, so run those out first and keep the best Nykthos turn for when their answers are gone.
• Win through abilities when you can. Lair of the Hydra, the Troll Aura's token, Nykthos activations and Boseiju's channel are activated abilities, not spells. You can build a winning board without casting anything.
• Leave mana up post-board. Nykthos turns often produce extra mana. Cast your key spell with some of it still open instead of stacking two must-resolve spells.
• Use Regisaur's protection. Once you flip Invasion of Ixalan, cast something before combat in a turn where they can answer it. Every spell you cast gives Belligerent Regisaur indestructible until end of turn.

Matchup Matrix

UR Aggro

This is the matchup the list has to survive. UR Aggro took 15 of 48 Top 8 slots and won 3 of 6 events (source: MTGTop8, 2026-10-01 to 2026-10-15). Their plan lines up badly against yours. Your accelerants are 1/1s, and every turn you spend rebuilding mana is a turn they spend attacking. Don't run Llanowar Elves and Elvish Mystic out as free value. Deploy them when they let you skip a turn, not just to add devotion.

Your best cards here are the ones that block and stick. Cavalier of Thorns is a 5/6 with reach that eats attackers all day. Old-Growth Troll forces two answers, because the first one leaves behind a Forest that taps for two and later makes a 4/4. Kiora, Behemoth Beckoner enters with 7 loyalty, which soaks damage that would otherwise hit you. Hard-cast Vibrance off green for the 2 life and the land. Win by stabilizing, then racing with Ulvenwald Oddity, since haste and trample punish them for tapping out. Spell Pierce and It'll Quench Ya! each appear in 13 of the 15 sideboards (source: MTGTop8, 2026-10-01 to 2026-10-15), so after sideboarding, lean on creatures and land activations over single big spells. For that side of the matchup, see our UR Aggro Pioneer guide.

Jund Sacrifice

They want a long, attrition-based game, and you're built to win long games. Every removal spell they point at Old-Growth Troll gives you a mana engine and a token maker. A dead Cavalier of Thorns stacks your best card on top of your library. Garruk, Curse Breaker produces 4/4 tramplers that their small sacrifice fodder can't block profitably. Don't overextend into a board they can trade with. Build to one Storm the Festival or Nykthos, Shrine to Nyx turn that puts two threats down at once, and keep draw engines like Kiora, Behemoth Beckoner and Outcaster Trailblazer online so you never run out of gas. For that side of the matchup, see our Jund Sacrifice Pioneer guide.

The Rock

The Rock won 2 of the 6 counted events (source: MTGTop8, 2026-10-01 to 2026-10-15). Expect them to trade one-for-one with your important pieces. You win by making every threat replace itself. A 4-power creature entering with Kiora, Behemoth Beckoner, Outcaster Trailblazer or Garruk, Curse Breaker in play is a two-for-one before they act. Invasion of Ixalan digs past their answers for the permanent you need. Lair of the Hydra gives you a late threat that stays a land until you choose otherwise. The Stone Brain in the sideboard deals with whichever card is beating you. For that side of the matchup, see our The Rock Pioneer guide.

Izzet Control

Your goal is to overload their answers. Leyline of the Guildpact from the opening hand begins on the battlefield and can't be stopped on the stack. Lair of the Hydra becomes a creature through an activated ability, not a spell. Plotting Outcaster Trailblazer spreads your threats across turns. Lead with your less important threats to draw out answers, and save Storm the Festival for when they're tapped low. Arasta of the Endless Web punishes every instant and sorcery they cast and is a strong addition after sideboarding.

Red Deck Wins

This plays like the UR matchup, with less countermagic. Your 4/4s and 5/6s wall their attackers quickly, so this game is about life total. Prioritize blockers over ramp once you're under pressure. Hexhaven Invigorator and Setessan Petitioner from the sideboard swing this matchup toward you. For that side of the matchup, see our Red Deck Wins Pioneer guide.

Other creature aggro

Decks with a fast creature curve and little burn have trouble attacking through your bodies. Block aggressively with Cavalier of Thorns and Old-Growth Troll, then take over the game with card draw.

Combo and graveyard decks

In game one you're racing, so mulligan toward fast hands and use Ulvenwald Oddity to close quickly. Boseiju, Who Endures can hit a key nonbasic land. After sideboarding, The Stone Brain removes a named combo piece from their graveyard, hand and library all at once.

Ramp and big-mana mirrors

Whoever turns the first big turn into both board presence and cards usually wins. Value Garruk, Curse Breaker and the draw-trigger permanents over raw mana. Elesh Norn, Mother of Machines doubles your enter-the-battlefield triggers and switches off theirs.

Sideboard / Tech Guide

This deck's sideboard does not try to patch weaknesses one card at a time. It changes what your top end does. Against fast decks you swap six-drops for bodies that stabilize and gain life. Against slow decks you swap low-impact slots for threats that answer permanents or can't be answered cleanly. Know which mode you're in before game 2 starts.

Summary

UR Aggro

This is the matchup to prepare for. UR Aggro took 15 of 48 Top 8 slots and won 3 of 6 counted events (source: MTGTop8, 2026-10-01 to 2026-10-15). Six-mana sorceries and five-mana walkers are too slow here, and a hard-drawn Leyline of the Guildpact is a four-mana card that doesn't block. Cut them.

Hexhaven Invigorator is the best card you bring in. It's a 6/6 vigilance creature for four green pips, so it adds four devotion for Nykthos, Shrine to Nyx. It blocks all day, and every point of damage it takes lets you fetch that many lands tapped. If they burn it and it survives, you ramp. If they chump it, you still have a 6/6. Arasta of the Endless Web punishes a spell-dense deck: every instant or sorcery they cast gives you a 1/2 reach blocker. Setessan Petitioner gains life equal to your devotion to green, so cast it after your dorks and Trolls are down, not on curve into an empty board.

It'll Quench Ya! and Spell Pierce each appear in 13 of the 15 UR Aggro Top 8 sideboards (source: MTGTop8 deck exports, 2026-10-01 to 2026-10-15). Expect post-board interaction. Your configuration is almost all creatures, which is the point.

Red Deck Wins

The cuts are the same as against UR Aggro. Swap Arasta of the Endless Web for Scrapshooter, and don't promise the gift unless they have an artifact or enchantment worth destroying. A 4/4 reach body for three is the card here. Handing them a free card is the opposite of what you want against burn. Evoking Vibrance with {G}{G} still finds a land and gains 2 life for two mana, so it stays.

Jund Sacrifice and The Rock

These games go long, and you win them by out-sizing their answers. Cityscape Leveler destroys a nonland permanent on cast and again on every attack. It comes back with unearth, so a removal spell only delays it. Remember that they get a tapped Powerstone each time.

Elesh Norn, Mother of Machines does two jobs. It doubles your enter-triggered abilities, including Cavalier of Thorns reveals and every draw trigger from Kiora, Behemoth Beckoner, Garruk, Curse Breaker and Outcaster Trailblazer. It also stops permanents entering from triggering anything your opponent controls. That second half is a real hoser if their engine runs on enter triggers. It needs {W}. Your white sources are:

• Sunken Citadel naming white
• Outcaster Trailblazer's mana trigger
• Leyline of the Guildpact, which makes your lands every basic land type

Don't board Norn in if you can't name a white source you expect to have. Trim a mana dork, because these decks kill dorks efficiently and you'd rather draw threats late.

Control

The free-from-the-opener value of Leyline of the Guildpact matters less than a drawn copy getting countered. Cut both. Arasta of the Endless Web turns every spell they cast into a reach body. That pressures planeswalkers and taxes their removal.

Emrakul, the Promised End is your trump. It has protection from instants, and its cast trigger takes their next turn, which happens even if Emrakul itself is answered. Its cost drops for each card type in your graveyard. Every Cavalier of Thorns reveal dumps the rest of the top five there, and a resolved Storm the Festival adds a sorcery. Count your types before you dig for Nykthos, Shrine to Nyx mana. Cityscape Leveler is a reasonable fifth card in if they rely on a planeswalker or other noncreature permanent.

Lotus Field and Dredge

The Stone Brain is a sorcery-speed answer. Cast it for two, then pay two and exile it to name a card. It removes up to four copies from their graveyard, hand and library. They draw a card for each copy taken from their hand, so the payoff is stripping library and graveyard copies before they assemble the combo. Name the piece their deck can't function without, not the one that beat you last game. Fire it early. Against combo, the turn you spend on it is cheapest before they're set up.

General Rules

• On the draw against aggro, cut every remaining six-drop.
• On the play against them, you can keep one Storm the Festival over a Petitioner.
• The fourth Outcaster Trailblazer comes in for any game expected to go past turn six. It's mana, a 4-power body and a draw engine in one slot.
• Never cut Nykthos, Shrine to Nyx or dorks against slow decks. Speed is what lets your big threats land before their answers line up.

Tech Choices & Variations

The engine is not up for debate: the eight one-mana dorks, four Nykthos, Shrine to Nyx, four Leyline of the Guildpact, four Storm the Festival, four Cavalier of Thorns and four Old-Growth Troll are the deck. The real decisions sit in about ten slots: the Outcaster Trailblazer count, the Ulvenwald Oddity and Garruk, Curse Breaker pairs, the lone Vibrance, the utility lands, and the three big threats in the sideboard. Every card discussed below is already in the 75, so any of these changes can be made without buying anything.

Outcaster Trailblazer: three main, one side

Outcaster Trailblazer does three jobs. It refunds a mana on entry, it draws off every later four-power creature, and its plot lets you spend a dead turn and deploy it for free later. The fourth copy is in the sideboard because the main deck already has two card-draw engines, Kiora, Behemoth Beckoner and Garruk, Curse Breaker, and stacking too many draw engines leaves you short on threats.

• Bring it up to four main against grindy midrange, where card flow matters more than speed.
• Keep it at three against fast decks. Its 2 toughness makes it a poor blocker, and it trades badly with cheap removal.

Ulvenwald Oddity vs. Garruk, Curse Breaker

These two pairs pull in opposite directions.

• Ulvenwald Oddity is your fastest pressure. It is a 4/4 trample haste for four, and late in the game, with a Nykthos turn, it becomes a team-wide haste anthem.
• Garruk, Curse Breaker is a mana engine. Its +2 untaps two lands, including Nykthos. It also makes its own 4/4 and draws cards.

Shift toward Oddity when opponents are trying to out-value you, so you close faster. Shift toward Garruk when the board stalls and an extra Nykthos activation each turn wins the game. Both have mana value 5 or less, so both remain Storm the Festival hits whichever way you lean.

The Vibrance slot

Cast with {G}{G}, Vibrance finds a land and gains 2 life. Cast with {R}{R}, it deals 3 damage to any target. Evoke gives you either effect for just two mana. You have several ways to make red mana:

• Outcaster Trailblazer's entry mana.
• A Sunken Citadel set to red.
• Any land while Leyline of the Guildpact is out, since your lands are then every basic land type.

That makes Vibrance your only main-deck removal for a creature. If your field is creature-heavy aggro, it is the first card to add a second copy of. A second copy can come from a Lair of the Hydra slot if you are comfortable lowering your land count slightly.

Utility lands

Boseiju, Who Endures counts as a land in your opening hand and as an answer to an artifact, enchantment or nonbasic land when you need one. Two copies is a light investment. Keep both against any deck built around a key artifact or a key nonbasic land.

Lair of the Hydra turns surplus mana into a threat that dodges sorcery-speed answers. It is the most cuttable land in the deck, because it enters tapped once you control two or more other lands.

Sunken Citadel is more flexible than it looks. Its two-mana mode can pay for:

• Nykthos's {2} activation.
• Lair's X cost.
• The sacrifice ability that Old-Growth Troll grants an enchanted Forest.

Four copies is correct. Cutting it weakens the deck's explosive turns.

Choosing a top end

The three sideboard threats solve different problems:

Against a field of slower interactive decks, Elesh Norn is worth considering as a main-deck one-of because Storm can find it. The other two stay as sideboard cards.

Tuning for your field

Start from the data. UR Aggro took 15 of 48 Top 8 slots in the sampled events, with Jund Sacrifice and The Rock at 5 each (source: MTGTop8, 2026-10-01 to 2026-10-15). Every one of those 15 UR Aggro lists played four Stormchaser's Talent and four Academic Dispute (source: MTGTop8 deck exports, 2026-10-01 to 2026-10-15). If your local field looks like that, adjust as follows.

• Tempo/aggro-heavy room: run a second Vibrance, lean toward Ulvenwald Oddity over Garruk, Curse Breaker, and have Arasta of the Endless Web and Hexhaven Invigorator ready. Arasta makes a reach blocker every time the opponent casts an instant or sorcery. Hexhaven's 6/6 vigilance body holds off small attackers.
• Midrange/sacrifice-heavy room: run the fourth Outcaster Trailblazer and the full Garruk pair. Consider Scrapshooter, a 4/4 reach body that also destroys an artifact or enchantment if you promise the gift.
• Combo or control room: move Elesh Norn, Mother of Machines into the main deck. Keep The Stone Brain in the sideboard for decks that rely on one named card, and keep both Boseiju, Who Endures.
• Burn-heavy room: bring in Setessan Petitioner, which gains life equal to your devotion to green. Each Leyline of the Guildpact alone adds four to that devotion.

Budget Options

The full list runs about $461 at TCGplayer market prices (approximate). Check individual prices yourself before you buy. The cost is likely concentrated in the land base, especially the four-ofs like Nykthos, Shrine to Nyx and Sunken Citadel, plus the legendary pieces: Boseiju, Who Endures, Kiora, Behemoth Beckoner and Garruk, Curse Breaker. The creature suite of mana dorks, trolls and cavaliers is where you should never cut corners, because it is also the part of the deck you can't replace.

What You Cannot Budget

• Nykthos, Shrine to Nyx is the deck. Without it, your devotion count does nothing and you are a pile of green creatures with no way to jump from four mana to ten. Buy all four first.
• Kiora, Behemoth Beckoner untaps Nykthos with its −1, which is how you generate a second big devotion activation in one turn. It also draws off every 4-power creature you play, and most of your creatures qualify. No card in the 75 does both jobs.
• Storm the Festival, Cavalier of Thorns and Old-Growth Troll are your top end and your devotion density. Cutting any of them weakens the core engine rather than a support slot.

Acceptable Swaps and What They Cost You

Two swaps look attractive but hurt more than they save:

• Cutting Sunken Citadel for basics. The Citadel's two-mana mode can only pay for abilities of land sources. That restriction is exactly what you want, because the {2} to activate Nykthos, Shrine to Nyx and the X cost on Lair of the Hydra are both land abilities. A Citadel plus Nykthos turns a modest board into a huge activation a turn early. Replacing all four makes the deck noticeably slower. If you must, cut two and keep two.
• Cutting Leyline of the Guildpact. It brings four hybrid mana symbols, each counting toward green devotion, and it often costs you nothing when it starts on the battlefield. It also makes every land you control every basic land type, so Boseiju, Who Endures, Sunken Citadel and Lair of the Hydra all become Forests for Old-Growth Troll. No cheap substitute replaces four devotion. Keep it in.

Budget Sideboard

The sideboard singletons are the easiest place to save money without touching game one. Elesh Norn, Mother of Machines, Emrakul, the Promised End and Cityscape Leveler are luxury top end. Your main deck already has big Nykthos turns, so these are upgrades, not necessities.

Start with the narrower, functional pieces:

• Scrapshooter answers artifacts and enchantments.
• Arasta of the Endless Web fights spell-heavy decks.
• Setessan Petitioner and Hexhaven Invigorator are your anti-aggro bodies. Hexhaven Invigorator is a 6/6 for four green pips that punishes burn and blocks.

Fill the remaining slots with a fifth Outcaster Trailblazer effect or extra copies of the cards you already own.

The metagame brief makes this sideboard order matter. UR Aggro took 15 of 48 Top 8 slots across six 32-player-plus events (source: MTGTop8, 2026-10-01 to 2026-10-15). If you're building on a budget, the cheap anti-aggro creatures earn their slots before the splashy singletons do.

Upgrade Path

1. Core shell: 4 Nykthos, Shrine to Nyx, 4 Llanowar Elves, 3 Elvish Mystic, 4 Old-Growth Troll, 4 Cavalier of Thorns, 4 Storm the Festival, 4 Kiora, Behemoth Beckoner, 4 Invasion of Ixalan, 4 Outcaster Trailblazer, 2 Ulvenwald Oddity, 4 Leyline of the Guildpact, and the rest Forest. This plays the real game plan.
2. Sunken Citadel: the biggest speed upgrade per dollar, since it directly powers up Nykthos.
3. Garruk, Curse Breaker: restores your second planeswalker and its land-untap mana.
4. Boseiju, Who Endures and Lair of the Hydra: utility lands that make you better without adding spell slots.
5. Vibrance, then the singleton sideboard bombs.

Each step on this path is a working deck. The budget version loses some flexibility and speed, but it doesn't lose the ability to win the game with a ten-mana Nykthos turn.

Common Mistakes

1. Activating Nykthos before your devotion is on the board

Nykthos, Shrine to Nyx costs {2} plus itself to activate. That means you need more than three devotion before the activation beats tapping Nykthos for {C} and keeping the other two mana. Firing it too early, with only an Elf and a Kiora, Behemoth Beckoner out, wastes your turn. Cast your cheap devotion first, then go to Nykthos.

Count everything when you tally devotion:

• Leyline of the Guildpact has four hybrid symbols, and each one is green, so it adds four green devotion.
• An Old-Growth Troll that has come back as an Aura still has {G}{G}{G} in its mana cost, so it still counts for three.
• An Invasion of Ixalan still on the battlefield counts for one.

Lands count for nothing. Run the count before you tap anything.

2. Wasting Sunken Citadel's restricted mana

Sunken Citadel makes two mana, but only for abilities of land sources. Players often tap it for a single green to cast a spell, then find they're one short for Nykthos. Plan the turn backward:

• Citadel's two restricted mana pays Nykthos's {2} activation by itself.
• Late, the same mana pays into Lair of the Hydra's {X}{G}.
• Name green when Citadel enters unless you have a specific reason not to.

Both Citadel and Lair can enter tapped, so play them on turns where you weren't spending all your mana anyway. A tapped Citadel on turn four is a missed Nykthos turn.

3. Casting payoffs before the draw engines

Kiora, Behemoth Beckoner, Garruk, Curse Breaker and Outcaster Trailblazer all draw whenever a creature with power 4 or greater enters. All three only trigger on creatures that enter after they are already in play. If you slam Old-Growth Troll and then cast Kiora, you just lost a card.

• When the mana allows, put the engine down first and the 4-power bodies second.
• Trailblazer is a 4-power creature itself, so it triggers Kiora and Garruk.
• Trailblazer's enters trigger gives you one mana of any color. Cast it mid-turn, not as the last spell.
• Plotting Trailblazer early lets you cast it for free later, so a later turn can be engine plus payoff in one go.

The same ordering applies inside a Storm the Festival. If the five cards show a walker and a creature, take both and you get the draw immediately.

4. Pointing your untap effects at the wrong land

Kiora's −1 untaps any target permanent, and Garruk's +2 untaps up to two lands. On a high-devotion board, the correct target is almost always Nykthos, Shrine to Nyx, which gives you a second full activation. The common error is using the untap before the first Nykthos activation, or spending it on a Forest out of habit. Do it in this order:

1. Activate Nykthos.
2. Untap Nykthos.
3. Activate it again.

Kiora's seven loyalty means she can do this for many turns. Don't treat her −1 as a one-time ramp spell.

5. Autopiloting Cavalier of Thorns and Storm the Festival

When Cavalier of Thorns dies, the exile is a "may," and the payoff is putting another graveyard card on top of your library. The usual target is a Storm the Festival that Cavalier's own trigger milled. First check whether you can pay Storm's {7}{G}{G}{G} flashback next turn:

• If you can pay the flashback: leave Storm in the graveyard and stack something else on top. You get both cards.
• If you can't: putting Storm on top turns your next draw into a six-mana bomb.

Also, don't forget the flashback exists at all. Big Nykthos turns in the late game should usually end with Storm cast from the graveyard.

6. Forgetting what Leyline does to your lands

With Leyline of the Guildpact out, your lands are every basic land type, so they tap for every color. Players miss two lines because of this.

• Vibrance: its damage trigger checks whether {R}{R} was spent, and its land-search trigger checks for {G}{G}. The generic {3} can be paid with colored mana, so five mana including {R}{R}{G}{G} gets you 3 damage, a land, and 2 life in one cast.
• Evoked Vibrance: evoking with {G}{G} still puts a 4-power creature onto the battlefield, which draws off Kiora, Garruk or Trailblazer.
• Old-Growth Troll: its Aura can enchant any land you control, not only a basic Forest. Enchanting Sunken Citadel gives it an unrestricted {T}: Add {G}{G}.

Without Leyline, only your real Forests qualify. Know which board state you're in before Troll dies.

7. Spending Boseiju as a land drop

Boseiju, Who Endures does tap for green. Its real job, though, is its channel ability, which destroys an opposing artifact, enchantment or nonbasic land for {1}{G}. Nothing in this main deck is a legendary creature, so expect to pay the full {1}{G}.

Playing Boseiju as your turn-two land when a Forest would do the same job throws away your only main-deck answer to opposing permanents of those types. Hold it unless you are short on lands or the opponent clearly has no targets.

8. Never attacking the battle

Invasion of Ixalan is not just a card-selection spell. Once you defeat it, you cast Belligerent Regisaur, which brings two things:

• It is a 4-power trampler, so it draws you a card off each engine you control.
• It gains indestructible each time you cast a spell.

When your board is wider than the opponent can block, sending a spare 4/4 at the battle often adds more pressure than the last few points to their face.

Tournament Prep & Final Notes

What to Practice Before the Event

• Counting devotion on the fly. Before every Nykthos activation, count the green symbols in the mana costs of everything you control. Leyline of the Guildpact alone contributes four, because every one of its hybrid symbols includes green. Kiora, Behemoth Beckoner's {G/U} counts too. You should be able to say "Nykthos makes seven" without touching your permanents.
• Untap loops. Rehearse the turns where Kiora, Behemoth Beckoner's −1 or Garruk, Curse Breaker's +2 untaps Nykthos, Shrine to Nyx for a second activation. Figure out in advance which payoff the extra mana buys: a flashback Storm the Festival, an Ulvenwald Oddity transform, or a lethal Lair of the Hydra.
• The aggro matchup. UR Aggro took 15 of 48 Top 8 slots in the 32+ player Pioneer events tracked (source: MTGTop8, 2026-10-01 to 2026-10-15). Most of your reps should go into games where you are under pressure and have to choose between a mana creature and a blocker on turn two.
• Sideboarding speed. Have your swaps decided before round one. The October 12 announcement made no Pioneer changes, and the next one is 2026-11-30 (source: Wizards of the Coast B&R announcement, 2026-10-12), so the format you prepare for should still be the format you play.

Rules Interactions to Know Cold

• Restricted mana from Sunken Citadel. The two-mana mode can only pay for abilities of land sources. Legal uses include:
  • the {2} for Nykthos, Shrine to Nyx;
  • the {X}{G} for Lair of the Hydra;
  • the {1} on a Forest enchanted by Old-Growth Troll.
  It cannot cast spells. Plan your taps around this.
• Leyline makes every land a Forest. With Leyline of the Guildpact out, Old-Growth Troll can return onto any land you control, including a Sunken Citadel. Without Leyline, the Troll's death trigger needs an actual Forest. Don't fetch away or sacrifice your last one carelessly.
• "All colors" doesn't change devotion. Leyline makes your nonland permanents every color, but devotion counts mana symbols in mana costs. A Llanowar Elves is still one green devotion and nothing else.
• Storm doesn't cast. Storm the Festival puts permanents onto the battlefield, so Vibrance gets neither enters bonus, because no mana was spent to cast it. Prioritize engines from Storm, not Vibrance. Lands, Invasion of Ixalan, Leyline of the Guildpact, Garruk, Curse Breaker and Cavalier of Thorns are all eligible.
• Evoking Vibrance still casts it. Paying {G}{G} through evoke still finds a land and gains 2 life. Because it's a 4/4 entering, it also draws off Kiora, Behemoth Beckoner, Garruk, Curse Breaker and Outcaster Trailblazer before it leaves.
• Animating Lair doesn't trigger draws. Lair of the Hydra becomes a creature but never enters, so no card-draw triggers fire. The 4/4 Troll tokens from an enchanted Forest do enter, and they do draw.
• Plotting. Outcaster Trailblazer can be plotted for {2}{G} at sorcery speed and cast free on a later turn. It still adds its one mana when it enters, so the free cast is effectively a mana-positive play on a big turn.
• Cavalier's death trigger. You exile Cavalier of Thorns and choose the card to put on top of your library. Its enters trigger dumps four nonland cards into your graveyard, which is also what shrinks Emrakul, the Promised End's cost after sideboarding.
• Elesh Norn, Mother of Machines after sideboarding. Your enters triggers fire twice, so each 4-power creature draws twice off each engine. Your opponent's permanents also stop triggering on things entering.

Clock Management

Your winning turns involve many triggers, untaps and manual payments. On MTGO's chess clock, that costs real time.

• Pay manually on engine turns. This keeps restricted Sunken Citadel mana from being wasted and stops Nykthos, Shrine to Nyx from being tapped for {C} when you meant to activate it.
• Plan during your opponent's turn. Decide your sequence then, so your own turn is execution rather than math.
• Batch draw triggers mentally. If you know three engines are out, every 4-power creature means three cards. Stop re-reading each trigger.
• Cash in on a won board. When you are clearly ahead, take the line that ends the game. Don't take the line that maximizes card advantage. A dominant board that times out is a draw at best.
• Fold dead games quickly. Concede early when a game is lost and save the clock for the next one.

Final Assessment

This list's win at a 46-player MTGO Challenge 32 on 2026-10-19 reflects a build that commits fully to its engine. Its card-draw engines include:

• Kiora, Behemoth Beckoner, Garruk, Curse Breaker and Outcaster Trailblazer, which draw off every 4-power creature;
• Invasion of Ixalan, which digs for the next one;
• Storm the Festival, which turns one spell into two permanents.

Leyline of the Guildpact and Sunken Citadel push Nykthos, Shrine to Nyx into absurd territory. Many of your threats come back or replace themselves: Old-Growth Troll returns as an Aura, and Cavalier of Thorns recurs a card when it dies.

The weakness is the one every ramp deck has. If you stumble on mana creatures against fast pressure, your hand is full of five-drops while you take damage. Nothing in the main deck interacts with spells beyond Boseiju, Who Endures. The sideboard brings that interaction:

• Arasta of the Endless Web, Scrapshooter and The Stone Brain give you answers;
• Setessan Petitioner and Hexhaven Invigorator give you lifegain and blockers;
• Elesh Norn, Mother of Machines, Emrakul, the Promised End and Cityscape Leveler give you top-end for grindy matchups.

If you can count devotion quickly, map your untap lines, and resist durdling when you're ahead, this is a deck that rewards preparation. Show up having drilled the aggro games and the engine math, and the list will do the rest.

Frequently Asked Questions

How does Devotion to Green actually win games?

It turns green mana symbols into huge amounts of mana with Nykthos, Shrine to Nyx, then converts that mana into a board the opponent can't block through. The kill usually comes from a transformed Ulvenwald Oddity, the −4 on Garruk, Curse Breaker giving attackers +2/+2 and trample, or Lair of the Hydra becoming a big X/X.

What are the most important cards in this mono-green Nykthos deck?

Nykthos, Shrine to Nyx is the payoff the whole deck is built around. Leyline of the Guildpact adds four devotion and is free from your opening hand, Sunken Citadel pays the Nykthos activation by itself, and Kiora, Behemoth Beckoner untaps Nykthos for a second activation while drawing off 4-power creatures.

What are the hardest matchups for Devotion to Green in Pioneer?

UR Aggro is unfavored and is the deck you should expect most, since your mana creatures are fragile 1/1s and you can end up in burn range before your five-drops land. Combo and graveyard decks are also unfavored because game one gives you almost no interaction.

What makes a hand keepable with this deck?

A keepable seven needs two or more lands with at least one green source on turn one, an accelerant or devotion engine like Llanowar Elves, Elvish Mystic or Leyline of the Guildpact, and something to spend the mana on. Hands missing lands almost never work, because mana creatures do not cover a missing Forest.

Which budget swaps are acceptable for this deck?

You can replace Boseiju, Who Endures or Lair of the Hydra with Forest, and Vibrance with a Forest or Setessan Petitioner. Avoid cutting Sunken Citadel or Leyline of the Guildpact, and never budget away Nykthos, Shrine to Nyx or Kiora, Behemoth Beckoner.

Why should I play draw engines before my big creatures?

Kiora, Behemoth Beckoner, Garruk, Curse Breaker and Outcaster Trailblazer only draw off power 4 or greater creatures that enter after they are already in play. Casting Old-Growth Troll before Kiora loses you a card, so put the engine down first and the bodies second.

How does Sunken Citadel's restricted mana work with Nykthos?

Sunken Citadel's two-mana mode can only pay for abilities of land sources, and it cannot cast spells. That means it pays the {2} Nykthos activation by itself and can also pay into Lair of the Hydra, so plan your taps around it and name green when it enters.

What should I practice before taking Devotion to Green to a tournament?

Practice counting devotion quickly and rehearse untap loops where Kiora or Garruk untaps Nykthos for a second activation. Put most of your reps into the UR Aggro matchup, and have your sideboard swaps decided before round one.

Metagame Context

Built from MandrillMan's 1st Place list at MTGO Challenge 32 (46 players, 2026-10-19), via MTGTop8. Metagame context comes from a research brief dated 2026-10-19 covering 2026-10-01 to 2026-10-19, drawn from MTGTop8; Wizards of the Coast. Card text and prices: Scryfall.

Source: tournament results. Decklist and placements as reported by the event organizer.