How to build Uldaros Theorix

Uldaros reads like a reward for burying something enormous. The six is a shared budget rather than a size limit, so the build that gets the most out of him is stocked with the cheapest cards in the format, and the best of them costs one mana and puts an eight-drop onto the battlefield.

Six mana value is one budget shared across every copy

The card invites you to bin something enormous and cash it in, and the line says the opposite once you read it twice. Six is the total for everything you cast off the trigger, and the copies come from separate columns, one per card type. The question is how many spells fit under the number, not how big one of them can be.

Reanimate at one, Skullclamp at one and Toxic Deluge at three is three spells for the whole budget and a fine turn. Bolas's Citadel alone is six and that is a fine turn too. What does not work is the middle. A seven-drop in the graveyard is not a payoff, it is a card the trigger cannot reach.

That pushes the curve down harder than an ordinary Dimir list. The average mana value here is 2.59 across 100 cards, and 41 of them cost one or two, which is what makes a trigger worth three spells instead of one.

The budget measures the copy, not what the copy does

This is the clause that pays for the expensive half of the deck. Reanimate has a mana value of one. What it does is put a creature card from a graveyard onto the battlefield, and nothing in the trigger's arithmetic cares how large that creature is. A sixth of the budget buys Archon of Cruelty, an eight-drop that makes an opponent sacrifice a permanent, discard a card and lose three life while you draw and gain three.

Animate Dead and Dance of the Dead do the same job out of the enchantment column, and Victimize does it twice out of the sorcery column. That is four separate ways to spend one or two mana value on a card that costs eight, and it is why Archon of Cruelty and Razaketh, the Foulblooded sit in a list whose average card costs under three.

A trap comes attached, and it is the kind you only find once. The trigger exiles what it targets. Take Archon of Cruelty as the creature target and you have just removed the card you meant to reanimate. Leave the fat creature alone in the graveyard and spend the creature column on something small you are happy to keep as a token.

Cast is the word that costs you

The trigger reads if you cast him, which closes every usual way of re-using an enters ability. Blinking him does nothing. Reanimating him does nothing. Casting him again is the only route, and commander tax prices that route at six, then eight, then ten.

Everything in the list that reduces costs is there for that one sentence. Semblance Anvil imprints a creature card and takes two off him. Sapphire Medallion and Jet Medallion take one each, because he is a blue spell and a black one. Dark Ritual and Cabal Ritual are in the deck twice over, once as real cards and once as the cheapest thing a trigger can find. Cabal Ritual is a two mana value instant that makes five black mana once seven cards are in your graveyard, which in this deck is most of the time, so a copy of it hands back most of what the commander cost.

Lightning Greaves and Swiftfoot Boots protect the body rather than the trigger, and two slots is a fair price, because every removal spell that answers him raises the cost of the next trigger by two.

The important half of the sentence is up to one

Every card the trigger targets is exiled whether or not you cast the copy of it, and a copy you do not cast never becomes anything. There is no reason to take a card in a column you cannot afford to cast. Filling all six columns greedily costs you the cards and buys nothing.

So you read the budget first and pick targets to fit it. Three targets is the common shape and four is available when the graveyard is cheap enough.

Three cards that look like they belong here and do not

Torment of Hailfire is the clean example. Its mana value in the graveyard is two, because a card outside the stack counts X as zero, so it slides under the budget with room to spare. Then you cast the copy without paying its mana cost, and the same rule that made it cheap sets X to zero on the way out. It is a blank.

Toxic Deluge looks like that card and is its opposite, which is worth understanding rather than memorising. Its X is an additional cost rather than part of its mana cost, so you still choose the number and still pay the life. A free Toxic Deluge is a real board wipe for half the budget and one of the best things this deck can find.

Counterspells are the second group. You cast the copies while the trigger is resolving, so there is nothing on the stack for them to answer. Swan Song and Drown in the Loch are in the list for their ordinary jobs, and Drown in the Loch at least has a mode that kills a creature, which is why it survived where a straight counterspell did not.

Tainted Pact is the third and the one most people will ask about, because it kills with Thassa's Oracle the same way Demonic Consultation does. It wants a mana base with a single basic land in it. This list runs fourteen. Building for it means giving up the fixing that lets a two-color deck cast and on schedule, and that is a real cost for a second copy of a combo that already has one.

The kill, and why this is still a bracket 3 list

Thassa's Oracle is two mana value and Demonic Consultation is one. Together they are half the budget and they end the game.

The order is the reverse of what it looks like. Cast Oracle first so that it sits underneath, then cast Consultation on top of it. Consultation resolves and exiles your library. Oracle resolves after that, enters, and its trigger measures a library of zero cards against your devotion to blue, which zero is never greater than. Cast them the other way round and Oracle checks a full library and does nothing at all.

Jace, Wielder of Mysteries is the backup, and the reason there is a planeswalker in the deck at all. He wins on your next draw with an empty library instead of immediately, which is slower, and he keeps the planeswalker column stocked so the trigger has something to take there.

The floor is bracket 3 on three Game Changers, which are Thassa's Oracle, Demonic Tutor and Bolas's Citadel. A two-card combo does not move that number by itself, and the honest reason this sits at bracket 3 rather than bracket 4 is that the combo lives behind a six-mana commander. You are not assembling it on turn three. You are casting a six-drop, by which point the table has had five turns to do something about it, and the turn you spend winning is the same turn you spent casting him.

Blue is short on paper and it does not matter

The mana comes out at 36 lands, 31 black sources and 27 blue. A strict reading says blue is nine short of what double blue by turn three wants, and that is true and not worth acting on. Three cards in the list ask for , and they are Thassa's Oracle, Jace, Wielder of Mysteries and Ashiok, Dream Render. None of the three is a turn-three play. Two of them are cards you would rather cast off the trigger for nothing, where pips do not exist at all.

Black is the color the deck needs early and it has 31 sources for it, clearing the single-pip test on turn two at 95.7%.

Some of the lands earn their slot twice. Undercity Sewers surveils on the way in, which is a card into the graveyard on the turn it fixes your colors. Ipnu Rivulet mills four for one blue and a sacrificed Desert. Bojuka Bog answers somebody else's graveyard off a land drop, and it is the rare piece of hate a graveyard deck can afford, because it points at a player you choose.

The core list

One hundred cards at bracket 3. Hovering any card name on this page shows the card.

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The same ninety-nine at two other prices

What moves between these rungs is not the plan. It is how fast the plan happens, and how often it happens at all.

The budget rung drops the list from roughly $579 to roughly $238 and keeps every part of the engine, which is possible because of an accident particular to this commander. The cards that make Uldaros work are cheap and the cards that make any Dimir deck strong are not. Sensei's Divining Top, Prismatic Vista, Morphic Pool, Polluted Delta and Otawara, Soaring City are five of the six most expensive cards in the core list, and not one of them has anything to do with the trigger. What leaves is fixing, selection and a tutor. What stays is the stocking, the reanimation, the free spells and the kill.

So this rung gives up consistency rather than power. Without Demonic Tutor you do not reliably have the right cheap card in the right column on the turn he lands, and a trigger that finds two good spells instead of three is a large turn rather than a winning one. It is still bracket 3, on two Game Changers rather than three, and it is still recognisably the same deck. Phyrexian Reclamation is the swap worth noticing on its own terms, because at one mana value it is a better trigger target than the Necromancy it replaced.

The other direction is a different argument. Roughly $2,315 buys twelve Game Changers, and the floor moves to bracket 4 the moment there are more than three of them. Mana Vault, Grim Monolith and Chrome Mox move the commander off turn five, Force of Will and Fierce Guardianship protect the turn you spend on him, and Lion's Eye Diamond is the rare piece of fast mana that fills the graveyard on its way out. Necropotence and Ad Nauseam turn an average mana value of 2.33 into a hand. This is the version that stops being welcome at a table that agreed on bracket 3, and it is worth saying so out loud rather than bringing it quietly.

FAQ

Is Uldaros Theorix good?

He is a six-mana 5/5 flier whose trigger only fires when you cast him, so he is worth exactly as much as the cheap cards sitting in your graveyard when he lands. In a list built for him, one cast is three free spells and a body. In a deck that happens to play good cards, one cast is a fair value creature that cost six. The gap between those two outcomes is wider than it is for most commanders.

What colors is Uldaros Theorix?

Blue and black. He costs three generic, one blue and two black, so his color identity is Dimir and a deck built around him can play any blue card, any black card, and any card whose identity falls inside those two.

How much does this Uldaros Theorix deck cost?

Roughly $579 at the cheapest paper printing of every card, with the commander unpriced until release, so that figure is a floor. The budget rung on this page keeps the same plan for roughly $238, and the bracket 4 rung runs to roughly $2,315.

When is Uldaros Theorix legal in Commander?

From 2 October 2026, the release date of Reality Fracture. Until then he reads as not legal, which means not yet rather than never. Every other card in this list is already legal, because that flag is recorded on each card rather than on the set it comes in.

Can you blink Uldaros Theorix to use his ability again?

No. The trigger carries an if you cast him clause, so flickering him, reanimating him or otherwise putting him onto the battlefield without casting him gives you a 5/5 flier and nothing else. Casting him again is the only way to repeat it, and commander tax makes each cast cost two more than the last.

What should you put in the graveyard for Uldaros Theorix?

One cheap card of each card type rather than one expensive card. The trigger takes up to one nonland card of each type and then caps what you cast at six mana value in total, so a one-mana sorcery, a one-mana artifact and a three-mana instant is three free spells, while a single seven-drop is none at all. The best card in the graveyard is usually a one-mana reanimation spell, because the budget measures the copy and not the eight-drop it returns.