Theater of Horrors

a land is played — 97 cards in the game can cause this (Theater of Horrors is one).

When a land plays a land thanks to Theater of Horrors:

1. Flubs, the Fool — draws you 1 card
2. Infernal Sovereign — draws you 1 card
3. Shadow of the Goblin — deals 1 damage
4. Dirtcowl Wurm — puts a +1/+1 counter on itself
5. The Endstone — draws you 1 card
6. Horn of Greed — makes a player draw 1 card
7. Pangosaur — triggers
8. City of Traitors — sacrifices itself
9. Burgeoning — puts a land onto the battlefield

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

a spell is cast — 155 cards in the game can cause this (Theater of Horrors is one).

When Theater of Horrors is cast:

1. Pia Nalaar, Consul of Revival — makes a token
2. Rocco, Street Chef — puts a counter on a creature
3. Urianger Augurelt — gains you 2 life
4. Gwen Stacy // Ghost-Spider — puts a +1/+1 counter on itself
5. Glaring Fleshraker — makes a token
6. The Kingpin of Crime — drains each opponent
7. Kami of Celebration — puts a counter on a creature
8. Leader's Talent — puts a counter on a creature
9. Quintorius Kand — deals 2 damage
10. Norin the Wary — flickers itself

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

anything is exiled — 2,497 cards in the game can cause this (Theater of Horrors is one).

1. The War Doctor — When a permanent is exiled thanks to Theater of Horrors, The War Doctor puts a time counter on itself

anything deals noncombat damage — 3,068 cards in the game can cause this (Theater of Horrors is one).

When Theater of Horrors deals noncombat damage:

1. Quest for Pure Flame — puts a quest counter on itself
2. Fear of Burning Alive — deals that amount damage
3. Niv-Mizzet, Visionary — draws you that many cards
4. Ghyrson Starn, Kelermorph — deals 2 damage
5. Chandra's Incinerator — deals that much damage
6. Chandra's Pyreling — gets +1/+0
7. Talon of Pain — puts a charge counter on itself
8. Asgardian Inspiration — returns itself from the graveyard
9. Thor, Guardian of Midgard — exiles a card from your library
10. Virtue of Courage // Embereth Blaze — exiles a card from your library

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

life is lost — 3,160 cards in the game can cause this (Theater of Horrors is one).

When Theater of Horrors makes a player lose life:

1. Far Fortune, End Boss — raises your speed
2. Zahur, Glory's Past — raises your speed
3. Mendicant Core, Guidelight — raises your speed
4. Aether Syphon — raises your speed
5. Vnwxt, Verbose Host — raises your speed
6. Embalmed Ascendant — raises your speed
7. Slick Imitator — raises your speed
8. Nesting Bot — raises your speed
9. Howlsquad Heavy — raises your speed
10. Hour of Victory — raises your speed

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

an enchantment is cast — 3,673 cards in the game can cause this (Theater of Horrors is one).

When Theater of Horrors is cast:

1. Invasion of Regatha // Disciples of the Inferno — gets +1/+1
2. Soul-Scar Mage — gets +1/+1
3. Tomik, Izzet Sparkmage — gets +1/+1
4. Hallowed Haunting — makes a token
5. Daxos the Returned — puts a counter on a permanent
6. Tatsunari, Toad Rider — makes a token
7. Sythis, Harvest's Hand — gains you 1 life
8. Sigil of the Empty Throne — makes a token
9. Dawnhart Geist — gains you 2 life
10. Artist's Talent — draws and discards

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

a nontoken enchantment enters the battlefield — 3,691 cards in the game can cause this (Theater of Horrors is one).

1. Historian's Boon — When Theater of Horrors enters, Historian's Boon makes a token

an enchantment enters the battlefield — 3,743 cards in the game can cause this (Theater of Horrors is one).

When Theater of Horrors enters:

1. Calix, Guided by Fate — puts a counter on a creature
2. Elvish Archivist — draws you 1 card
3. Victor, Valgavoth's Seneschal — surveils
4. Strength from the Fallen — gives +X/+X, where X is the number of creature cards in your graveyard
5. Doomwake Giant — shrinks a creature by -1/-1
6. Cacophony Unleashed — turns something into a creature
7. Ghostly Dancers — makes a token
8. Killian, Decisive Mentor — taps a creature
9. Thoughtrender Lamia — makes an opponent discard a card

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