Ulamog, the Infinite Gyre

an Eldrazi creature it makes cheaper to cast — 65 cards in Ulamog's colors can cause this.

1. Eye of Ugin — Eye of Ugin reduces what Ulamog, the Infinite Gyre costs

64 other cards cause it too. These are the ones with the most connections.

a card in a graveyard — 664 cards in Ulamog's colors can cause this (Ulamog is one).

Ulamog, the Infinite Gyre:

1. Heart-Shaped Herb — puts cards into the graveyard that Heart-Shaped Herb can bring back
2. Reito Sentinel — puts cards into the graveyard that Reito Sentinel can bring back
3. Chrome Companion — puts cards into the graveyard that Chrome Companion can bring back
4. Phyrexian Archivist — puts cards into the graveyard that Phyrexian Archivist can bring back
5. Malevolent Chandelier — puts cards into the graveyard that Malevolent Chandelier can bring back
6. Cogwork Archivist — puts cards into the graveyard that Cogwork Archivist can bring back
7. Jade-Cast Sentinel — puts cards into the graveyard that Jade-Cast Sentinel can bring back
8. Hoverstone Pilgrim — puts cards into the graveyard that Hoverstone Pilgrim can bring back
9. Junktroller — puts cards into the graveyard that Junktroller can bring back
10. Relic Golem — fills an opponent's graveyard toward the 8 or more cards Relic Golem needs

33 other cards care about it too. These are the ones with the most connections.

a creature attacks — 749 cards in Ulamog's colors can cause this (Ulamog is one).

When Ulamog, the Infinite Gyre attacks:

1. Adaptive Omnitool — searches a library
2. Staff of Titania — makes a token
3. Inquisitorial Rosette — makes a token
4. Andúril, Flame of the West — makes 2 tokens
5. Moonsilver Spear — makes a token
6. Captain's Claws — makes a token
7. Sigiled Sword of Valeron — makes a token
8. Saw — sacrifices a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Throwing Knife — sacrifices itself

26 other cards care about it too. These are the ones with the most connections.

anything attacks — 749 cards in Ulamog's colors can cause this (Ulamog is one).

When Ulamog, the Infinite Gyre attacks:

1. ED-E, Lonesome Eyebot — puts a quest counter on itself
2. Dawnsire, Sunstar Dreadnought — deals 100 damage
3. Twins of Discord — triggers
4. Cosmic Cube — triggers
5. Doom's Time Platform — exiles a card from your graveyard

2 other cards care about it too. These are the ones with the most connections.

a creature blocks — 749 cards in Ulamog's colors can cause this (Ulamog is one).

When Ulamog, the Infinite Gyre blocks:

1. Barrow-Blade — strips abilities
2. Dead-Iron Sledge — kills a creature

a creature is cast — 755 cards in Ulamog's colors can cause this (Ulamog is one).

When Ulamog, the Infinite Gyre is cast:

1. Oketra's Monument — makes a token
2. Bontu's Monument — makes each opponent lose 1 life
3. Vanquisher's Banner — draws you 1 card
4. Rhonas's Monument — gives +2/+2
5. Traxos, Scourge Eternal — untaps itself
6. Hazoret's Monument — draws and discards
7. Kefnet's Monument — triggers

5 other cards care about it too. These are the ones with the most connections.

a nontoken creature enters the battlefield — 784 cards in Ulamog's colors can cause this (Ulamog is one).

1. Minion Reflector — When Ulamog, the Infinite Gyre enters, Minion Reflector makes a token

a creature enters the battlefield — 905 cards in Ulamog's colors can cause this (Ulamog is one).

When Ulamog, the Infinite Gyre enters:

1. Glaring Fleshraker — deals 1 damage
2. Blasting Station — untaps itself
3. Bloodline Pretender — puts a +1/+1 counter on itself
4. Soultether Golem — puts a time counter on itself
5. Symmetry Matrix — draws you 1 card
6. Monkey Cage — sacrifices itself
7. Eldrazi Mimic — triggers
8. Portcullis — flickers a creature
9. Decoction Module — puts a counter on a permanent you control
10. Ronin Warclub — triggers

12 other cards care about it too. These are the ones with the most connections.