Ruhan of the Fomori

a Warrior creature enters the battlefield — 683 cards in Ruhan of the Fomori's colors can cause this (Ruhan of the Fomori is one).

1. Obsidian Battle-Axe — When Ruhan of the Fomori enters, Obsidian Battle-Axe triggers

a Warrior enters the battlefield — 685 cards in Ruhan of the Fomori's colors can cause this (Ruhan of the Fomori is one).

1. Mardu Woe-Reaper — When Ruhan of the Fomori enters, Mardu Woe-Reaper hits a graveyard

a creature attacks — 9,650 cards in Ruhan of the Fomori's colors can cause this (Ruhan of the Fomori is one).

When Ruhan of the Fomori attacks:

1. Adaptive Omnitool — searches a library
2. Kindred Discovery — draws you 1 card
3. Anim Pakal, Thousandth Moon — puts a +1/+1 counter on itself
4. Screaming Swarm — mills a card
5. Imperious Mindbreaker — mills a card
6. Saw — sacrifices a creature
7. Ultima Weapon — kills a creature an opponent controls
8. Total War — kills a creature
9. The Spear of Leonidas — triggers
10. Super-Soldier Serum — triggers

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

anything attacks — 9,650 cards in Ruhan of the Fomori's colors can cause this (Ruhan of the Fomori is one).

When Ruhan of the Fomori attacks:

1. ED-E, Lonesome Eyebot — puts a quest counter on itself
2. Surgical Suite // Hospital Room — puts a counter on a creature
3. Guide of Souls — triggers
4. Gossip's Talent — triggers
5. Banon, the Returners' Leader — draws and discards
6. Three Dog, Galaxy News DJ — sacrifices an Aura
7. Inti, Seneschal of the Sun — triggers
8. Gut, True Soul Zealot — sacrifices a creature or artifact
9. Cool but Rude — draws and discards
10. Swashbuckler Extraordinaire — sacrifices a Treasure

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

a creature blocks — 9,650 cards in Ruhan of the Fomori's colors can cause this (Ruhan of the Fomori is one).

When Ruhan of the Fomori blocks:

1. Barrow-Blade — strips abilities
2. Heat of Battle — deals 1 damage
3. Battle Strain — deals 1 damage
4. Noble Stand — gains you 2 life
5. Battle Cry — gives +0/+1
6. Tide of War — sacrifices a creature
7. Dead-Iron Sledge — kills a creature
8. Dwindle — kills a creature
9. Shield of the Righteous — triggers

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

a nontoken creature attacks — 9,650 cards in Ruhan of the Fomori's colors can cause this (Ruhan of the Fomori is one).

When Ruhan of the Fomori attacks:

1. Basri Ket — makes a token
2. Militia's Pride — makes a token

a creature deals combat damage — 9,650 cards in Ruhan of the Fomori's colors can cause this (Ruhan of the Fomori is one).

1. Antagonist Incorporator — When Ruhan of the Fomori deals combat damage, Antagonist Incorporator makes a token

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

a creature is cast — 9,685 cards in Ruhan of the Fomori's colors can cause this (Ruhan of the Fomori is one).

When Ruhan of the Fomori is cast:

1. Summon: Brynhildr — grants haste
2. God-Eternal Oketra — makes a token
3. Oketra's Monument — makes a token
4. Kozilek's Unsealing — makes 2 tokens
5. The Clone Saga — copies a spell
6. Oltec Matterweaver — triggers
7. Pure Reflection — kills a Reflection
8. Flickering Hound — flickers a creature you control
9. Hazoret's Monument — draws and discards
10. Aether Barrier — makes a player sacrifice a permanent

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

a nontoken creature enters the battlefield — 9,868 cards in Ruhan of the Fomori's colors can cause this (Ruhan of the Fomori is one).

When Ruhan of the Fomori enters:

1. Angelic Sell-Sword — makes a token
2. Arni, Humble Scribe — untaps itself
3. Spirit Bonds — makes a token
4. Metastatic Evangel — proliferates
5. Minion Reflector — makes a token
6. Molten Echoes — makes a token
7. Radiant Solar — triggers
8. Anafenza, Kin-Tree Spirit — puts a counter on a permanent

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

a creature enters the battlefield — 10,645 cards in Ruhan of the Fomori's colors can cause this (Ruhan of the Fomori is one).

When Ruhan of the Fomori enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Gimli of the Glittering Caves — puts counters on a permanent
3. Ray Fillet, Wave Warrior — puts a counter on itself
4. The Neutrinos — gets +1/+0
5. Wingnut, Bat on the Belfry — grants flying, haste and menace
6. Aetherstorm Roc — puts a counter on a permanent you control
7. Raphael, Most Attitude — exiles a card from your library

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

anything enters the battlefield — 15,181 cards in Ruhan of the Fomori's colors can cause this (Ruhan of the Fomori is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Ruhan of the Fomori enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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