The Balrog, Flame of Udûn

a Demon enters the battlefield — 215 cards in The Balrog's colors can cause this (The Balrog is one).

1. Blood Speaker — When The Balrog, Flame of Udûn enters, Blood Speaker returns itself from the graveyard

a nontoken creature leaves the battlefield — 1,893 cards in The Balrog's colors can cause this (The Balrog is one).

When The Balrog, Flame of Udûn leaves the battlefield:

1. Tokka & Rahzar, Unsupervised — puts a +1/+1 counter on itself
2. Splinter, the Mentor — makes a token
3. Rat King, Pale Piper — makes a token

a creature leaves the battlefield — 1,966 cards in The Balrog's colors can cause this (The Balrog is one).

When The Balrog, Flame of Udûn leaves the battlefield:

1. Extractor Demon — mills a card
2. Ninja Teen — makes each opponent lose 1 life
3. Outpost Siege — deals 1 damage
4. Traveling Plague — returns itself from the graveyard
5. Funeral March — makes a player sacrifice a creature

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

anything attacks — 6,499 cards in The Balrog's colors can cause this (The Balrog is one).

When The Balrog, Flame of Udûn attacks:

1. Far Fortune, End Boss — deals 1 damage
2. Grim Javelineer — gives +1/+0
3. ED-E, Lonesome Eyebot — puts a quest counter on itself
4. Fire Navy Trebuchet — makes a token
5. Misty Mountains Raider — puts 2 counters on a Goblin or Army
6. Razorkin Hordecaller — makes a token
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

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

a creature attacks — 6,499 cards in The Balrog's colors can cause this (The Balrog is one).

When The Balrog, Flame of Udûn attacks:

1. Adaptive Omnitool — searches a library
2. Anthem of Rakdos — gives +2/+0
3. Chorale of the Void — brings a card back
4. Ingris Stingerquill — deals 1 damage
5. Staff of Titania — makes a token
6. Saw — sacrifices a creature
7. Gisa's Favorite Shovel — makes an opponent sacrifice a creature
8. Ultima Weapon — kills a creature an opponent controls
9. Total War — kills a creature
10. The Spear of Leonidas — triggers

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

a creature blocks — 6,499 cards in The Balrog's colors can cause this (The Balrog is one).

When The Balrog, Flame of Udûn blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Carnage Gladiator — makes a player lose 1 life
3. Barrow-Blade — strips abilities
4. Heat of Battle — deals 1 damage
5. Battle Strain — deals 1 damage
6. Tide of War — sacrifices a creature
7. Dead-Iron Sledge — kills a creature

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

a creature deals combat damage — 6,499 cards in The Balrog's colors can cause this (The Balrog is one).

1. Hive Mind Coprocessor — When The Balrog, Flame of Udûn deals combat damage, Hive Mind Coprocessor makes you lose life

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

a creature is cast — 6,529 cards in The Balrog's colors can cause this (The Balrog is one).

When The Balrog, Flame of Udûn is cast:

1. Endrek Sahr, Master Breeder — makes that spell's mana value tokens
2. Summon: Brynhildr — grants haste
3. Oketra's Monument — makes a token
4. Screamer-Killer — deals 5 damage
5. Bontu's Monument — makes each opponent lose 1 life
6. Vanquisher's Banner — draws you 1 card
7. Skittering Horror — sacrifices itself
8. Skittering Skirge — sacrifices itself
9. Skittering Monstrosity — sacrifices itself
10. Hazoret's Monument — draws and discards

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

a nontoken creature enters the battlefield — 6,736 cards in The Balrog's colors can cause this (The Balrog is one).

When The Balrog, Flame of Udûn enters:

1. Minion Reflector — makes a token
2. Molten Echoes — makes a token
3. Flameshadow Conjuring — makes a token
4. Mirror March — flips a coin

1 other card cares about it too. These are the ones with the most connections.

a creature enters the battlefield — 7,209 cards in The Balrog's colors can cause this (The Balrog is one).

When The Balrog, Flame of Udûn enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Gimli of the Glittering Caves — puts counters on a permanent
3. Wingnut, Bat on the Belfry — grants flying, haste and menace
4. Ayara, First of Locthwain — makes each opponent lose 1 life
5. Blasting Station — untaps itself
6. Raphael, Most Attitude — exiles a card from your library
7. Mogg Bombers — sacrifices itself
8. Flame-Kin War Scout — sacrifices itself
9. Monkey Cage — sacrifices itself

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