Ulalek, Fused Atrocity Commander Deck Guide

Last updated on January 28, 2026

Ulalek, Fused Atrocity | Illustration by Cosmin Podar

I remember the Eldrazi days when there was only Kozilek, Butcher of Truth and Ulamog, the Infinite Gyre. And Emrakul, of course. These were unstoppable, weird, titanic colorless creatures, capable of devouring entire planes. Turns out, Kozilek and Ulamog fused. Now we have Ulalek, Fused Atrocity, and they also fused with the mana from the plane, because we can use colored spells now. Hooray!

A quick search online shows that outside Morophon, the Boundless (which isn’t even a real Eldrazi, by the way), there’s not a dedicated Eldrazi 5-color commander. There are substitutes, like Jodah, Archmage Eternal, which allows you to Fist of Suns your Eldrazi out.

With the Eldrazi Incursion MH3 Commander precon, we have Ulalek, Fused Atrocity and Azlask, the Swelling Scourge as options. Today we get all over Ulalek, Fused Atrocity as an Eldrazi commander, see what makes it tick, and go over options to build it in a fairly different way from its EDH precon deck.

Don’t sleep on Azlask though, it’s a very potent commander too, but that’s a subject for another Commander guide.

The Deck

Herald of Kozilek | Illustration by Johannes Voss

This deck is a pseudo 5-color deck. It uses all the colors of mana, but most of the colored spells are devoid cards, and it’s heavy on colorless mana. Since your commander is focused on playing more Eldrazi, most spells are Eldrazi spells – around a third of the deck, and that matters because whenever you cast an Eldrazi spell, you can pay 2 colorless mana to copy all spells you control, then copy all your triggered abilities and activated abilities on the stack. It's a lot, I know.

This deck is roughly split between one-third Eldrazi, one-third land, and one-third support cards, which include a flash sub-theme that goes well with Ulalek’s ability.

The Commander: Ulalek, Fused Atrocity

Ulalek, Fused Atrocity is a small 2/5 for 5 mana, admittedly not the biggest thing you can have in your command zone, especially when you think of Eldrazi – they’re usually 7/7 bodies or bigger. It’s interesting to note that you can cast Ulalek with hybrid mana: you either require colorless mana or colored ones. You need to play Wastes or nonbasics that generate colorless mana. Activation of Sol Ring and Mana Vault gives you exactly 5 mana. That means it’s possible to cast this commander as early as turn 1 and 2.

What Ulalek does best is copy Eldrazi spells and triggers on the stack, effectively working as a trigger and ability doubler. For that, you need to pay 2 colorless mana. Since Ulalek uses the stack, you want instants and cards with flash. That’s why a part of this deck is dedicated to casting your spells with flash.

Here’s a sample of Ulalek in action:

With your commander in play and 5 mana, cast Herald of Kozilek, pay the , then, while it’s on the stack, pay the 2 colorless mana. You get a copy of Herald of Kozilek and the Herald itself, so now you have two 2/4 Eldrazi that reduce the cost of colorless spells by a total of two mana.

It gets better if said Eldrazi has a “when you cast” trigger, like Nulldrifter or Flayer of Loyalties, because you get to copy the trigger as well.

The Creatures

This EDH deck requires a mix of cheap creatures and expensive ones. The cheap spells in this deck are good because not only do they fill your curve, but it’s also easier to pay the 2 mana from Ulalek after casting a cheap spell. That said, sometimes you can cast an Eldrazi titan and pay the 2, and sometimes you don’t even care about it because the spell is so awesome by itself.

Cheap Creatures

Ever since Battle for Zendikar and Oath of the Gatewatch, there have been powerful Eldrazi in the lower part of the mana curve. You need these to survive the early game and to start your ramping process. Cards like Mutable Explorer, Glaring Fleshraker and It That Heralds the End fit this bill, as well as Mischievous Sneakling which counts as a cheap eldrazi spell with flexible timing. Skittering Cicada and Eldrazi Mimic start small and grow over time.

Expensive Titans

The endgame in this deck is extremely powerful. You cast cards like Sire of Seven Deaths, Hideous Taskmaster, Flayer of Loyalties, or Emrakul, the World Anew, as well as the different versions of Kozilek and Ulamog. These are your best haymakers, and god forbid you can copy their ETB triggers with your commander. Ulalek only copies the casting trigger because if you copy a legendary creature without something like Mirror Gallery in play, you’ll have to choose between one of the two legendary creatures.

Flash

Liberator, Urza's Battlethopter, Leyline of Anticipation, Vedalken Orrery, Vivien, Champion of the Wilds, and Skittering Cicada fill this slot. The idea is to be able to cast a spell with flash or at instant speed while Ulalek, Fused Atrocity’s trigger is on the stack. This way, you’ll copy the Eldrazi you’ve previously cast and the new spell. You can make a big stack by playing spells with flash and copying everything on the stack.

Interaction and Sweepers

Most of the deck’s cards are creatures and ramp, so that leaves little slots for interaction. That said, there are a few interesting choices here to discuss:

Crib Swap is a white instant spot removal that’s also an eldrazi spell, given that it's a kindred/tribal card. That means you’ll often get two targets with your commander’s 2-mana copy ability. Three mana to get something isn't great, but 5 mana to get two creatures is much more worth it.

Cheap white removal staple Swords to Plowshares is easy to include in the stack, especially in a turn when you already want to copy a cast Eldrazi spell.

Null Elemental Blast almost always has a multicolor target to hit. It’s EDH, after all, so it’s very rare to play against three mono-color commanders.

It’s not the main focus of this deck, but there are some sweeper effects, like All Is Dust which is a Plague Wind in this deck. If your flash engine is on, you can have more interaction, like flashing a giant creature like Anticausal Vestige to block, or getting powerful ETB triggers at instant speed.

Eldrazi Scions and Spawns Matter

There are many cards in this deck that make Eldrazi spawns and Eldrazi Scions. Skittering Invasion, Vile Redeemer, and Drowner of Hope. These can be used to ramp, and with your commander, these spells can produce double the tokens. But that’s not all these small creatures can do. You have cards like It That Heralds the End and Kozilek, the Broken Reality that buff colorless creatures, so even these tiny eldrazi can become larger threats. Plus, there’s Azlask, the Swelling Scourge that benefits from all the eldrazi death triggers, and can eventually mass-pump your whole board while giving annihilator and indestructible to scions and spawns.

Colorless Matters

The bulk of this deck is colorless, so here are some ways to take advantage of this:

• Ugin, the Ineffable makes your spells 2 mana cheaper (which is exactly how much you have to pay for Ulalek’s ability).
• Mystic Forge lets you cast colorless spells from the top of your library
• Forsaken Monument is a colorless build-around card. You’ll get more mana, gain life, and buff your creatures.
• Skittering Cicada gives your colorless spells flash.
• Herald of Kozilek makes your colorless spells 1 mana cheaper.
• Echoes of Eternity is similar, doubling the triggers of colorless spells and permanents.
• Kozilek, the Broken Reality can add a whopping +3/+2 to your colorless creatures. When each eldrazi scion token is a 3/3 creature, the beatdown is real.

The Mana Base

Regarding mana production, the most interesting thing about this deck is the addition of the 10 pain lands (Adarkar Wastes, Brushland, etc.). These generate colorless mana without a downside, and that’s what you need primarily. If you need a specific color of mana, you can resort to these lands and some life.

You have one of each basic land that can be fetched by specific cards. There’s also one of each Urza land, and Urza's Cave – those have the power to generate a lot of colorless mana, and you can assemble Tron with Expedition Map.

To finish the ramp package, there are staple mana producers in Sol Ring, Palladium Myr, and Mana Vault. Since you play eldrazi, it’s only natural to add cards like Eye of Ugin and Eldrazi Temple, as well as lands like Tomb of the Spirit Dragon that get better in the late game. Finally, there’s Alchemist's Refuge, a utility land that allows you to cast spells with flash, adding redundancy to the flash engine.

The Strategy

This deck’s strategy is very similar to your typical ramp deck. You want to survive the early game, establish your board presence, and later in the game turn the corner and become the main menace with powerful spells. Besides the mana rocks like Sol Ring and Firdoch Core, you’ll want to see cards like It That Heralds the End, Glaring Fleshraker, and Herald of Kozilek early in the game, because these help you develop and are cheap spells.

After casting your commander, it’s time to start controlling the board with cards like Drowner of Hope, and Thief of Existence, ideally doubled by Ulalek, Fused Atrocity.

Your late game will be backed up by Nulldrifter’s card draw, the recursion of Eye of Ugin, or the sheer presence of strong eldrazi like Ulamog, the Ceaseless Hunger or Kozilek, the Broken Reality.

Combos and Interactions

The complicated part of this deck can be described in a few examples. You see, when commanders use the stack heavily and copy spells and triggers, a few rules-related problems can appear.

First, Ulalek’s “pay 2 mana” trigger only happens when you cast an Eldrazi spell. You can’t pay the 2 after casting Sol Ring or Skittering Cicada.

Second, most Eldrazi spells have a “when you cast” trigger, and that goes on the stack as well, so Ulalek’s ability copies that. Ulalek will not copy ETB triggers. When Ulalek copies a spell, you won’t get the “when you cast” bonus. But the biggest difficulty is that Ulalek is able to copy the whole stack, no matter how many spells and triggers you have there. Here are a few examples to understand this better.

With Ulalek in play and 8 mana, cast Drowner of Truth. The stack has these effects:

• Create two 0/1 Eldrazi Spawns.
• The spell Drowner of Truth.
• Pay 2 mana for Ulalek’s ability.

Pay the 2 mana, so that everything above is doubled:

• Create two 0/1 Eldrazi Spawn.
• Copy of create two 0/1 Eldrazi Spawn.
• The spell Drowner of Truth.
• The copy of Drowner of Truth.

After all these resolve, you’ll have four Eldrazi Spawn, Drowner of Truth in play, and a copy of Drowner – that’s two 7/6 creatures and four creature tokens. Neat!

But suppose you also have Glaring Fleshraker in play. Fleshraker sees one spell being cast, so it creates a 0/1 and deals 1 damage to each opponent. The card also sees six more colorless creatures entering the battlefield, so that’s 6 damage to each opponent – seven total. Ouch.

My final example is slightly more complicated, and it involves casting spells with flash in response to an Eldrazi being cast.

Step 1: Cast Sowing Mycospawn with kicker.

Step 2: Flash Vile Redeemer in response.

Here’s the stack:

• Kicked Sowing Mycospawn[eldrazi spell #1].
• Search your library for a land cast trigger.
• Exile target land cast trigger.
• Vile Redeemer[eldrazi spell #2].
• Pay the 1 colorless cast trigger to make scions.
• Pay the 2 mana from Ulalek [1].
• Pay the 2 mana from Ulalek [2].

After paying the 2 mana once:

• Kicked Sowing Mycospawn[Eldrazi spell 1].
• Copy of Kicked Sowing Mycospawn.
• Search your library for a land cast trigger.
• Copy of search your library for a land cast trigger.
• Exile target land cast trigger.
• Copy of exile target land cast trigger.
• Vile Redeemer[Eldrazi spell 2].
• Copy of Vile Redeemer.
• Pay the 1 colorless cast trigger to make scions.
• Copy of pay the 1 colorless cast trigger to make scions.
• Pay the 2 mana from Ulalek [1].

I could keep writing about what happens if you pay 2 more. For this interaction alone, you’ll get two Sowing Mycospawns, search for two lands, exile two lands, get two Vile Redeemer, and some Eldrazi Scions if you pay mana. Imagine what happens if you cast Swords to Plowshares in response. The sky is the limit if you have enough mana!

Here are other examples of how this deck works:

Keep in mind that you have many cost-reduction abilities in this deck. From Conduit of Ruin to Eye of Ugin and Ugin, the Ineffable, suddenly you can cast your spells with a 6-mana discount.

A copied Skittering Invasion gives you 10 creatures, either to attack or to sacrifice and generate mana. If you have something like Forsaken Monument around, it’s a small army of 10 little 2/3 creatures.

Hope-Ender Coatl can be a surprise counterspell backed up by Ulalek’s doubling abilities. You’ll be left with many 2/2 fliers and your opponent without a spell.

This deck has some of the weirdest win conditions involving annihilator cards. A copied Hideous Taskmaster gives you 6 of your opponent’s best creatures and two 7/2 trample creatures, and they all have trample and annihilator 1. That’s eight annihilator triggers on the attack, on top of all the trampling power. But then you have Echoes of Eternity which doubles all the annihilator triggers. A Drowner of Hope can win you the game just by sacrificing Eldrazi tokens and tapping your opponent’s creatures.

Cards like Mystic Forge and Skittering Cicada care about colorless, not eldrazi, but a huge chunk of your deck are colorless spells anyway.

It may be a trivial observation, but even though an eldrazi spell is countered, the “when you cast” trigger will still happen. If your Ulamog, the Ceaseless Hunger gets countered, you’ll still be able to exile two permanents. The triggers can be Stifled, though.

Rule 0 Violations Check

This deck is a bracket 3 Commander deck because it plays strong cards, but there’s not an infinite combo in the deck list or a play pattern that goes off before turn 4. Rest assured, this deck is rule 0 proof. What can annoy players is if you keep using the stack and double or triple your spells.

Budget Options

This is also an important part of this deck to be taken into consideration. Many spells in your deck are very, very expensive, and if you want to build a similar version without the more expensive cards, there are some substitutes:

Azlask, the Swelling Scourge, Ulalek, Fused Atrocity, and Eye of Ugin are vital inclusions in this deck, and two of these can be acquired with the precons.

Ugin's Labyrinth is one of the best cards from Modern Horizons 3… and, it's one of the more expensive cards in MH3. Urza's Saga is always expensive. Two Wastes can replace them.

Mana Vault is also a huge budget problem. Let's replace it with either Worn Powerstone or Basalt Monolith.

Other than that, you have the Eldrazi Titans which are always expensive. You can replace them with smaller eldrazi:

• Emrakul, the World Anew can be replaced by Breaker of Creation.
• Kozilek, Butcher of Truth can be replaced by It That Betrays.
• Kozilek, the Broken Reality can be replaced by Decimator of the Provinces.
• Ulamog, the Defiler can be replaced by Artisan of Kozilek.

Other Builds

I show you a more flash-oriented approach to maximize Ulalek’s trigger. But this is a 5-color commander, so many things are viable. This commander can go all aggro with cheap Eldrazi and good ETB triggers, but I think that this version is better helmed by the other commander in this precon deck, Azlask, the Swelling Scourge.

You can focus on many eldrazi creatures that make scions and spawns and play something like Broodwarden and Mondrak, Glory Dominus. Since these tokens are easily sacrificed, an aristocrat build isn’t out of the question either. Last, but not least, something like going crazy with expensive spells and Maskwood Nexus. Add in some magecraft cards and you’re set.

Commanding Conclusion

Oblivion Sower | Illustration by Jaime Jones

Ulalek, Fused Atrocity is a very fun, crazy, and powerful Eldrazi commander – as eldrazi should be. It’s easy to lose yourself in the many interactions this deck can provide, and if you’re not confident enough in your stack skills, maybe MTGO and MTG Arena can help you with these. Still, it’s a great opportunity to know more about the game and its rules and interactions.

It’s also an opportunity to play Eldrazi in commander without having to make your deck 100% colorless. I love this one, and Modern Horizons 3 in general. What about you? How would you build Ulalek? Let me know in the comments section or in our Draftsim Discord.

Thank you for reading, and stay safe out there.