Agent of the Shadow Thieves

a creature gets a counter — 2,691 cards in the game can cause this (Agent of the Shadow Thieves is one).

When a creature gets a counter thanks to Agent of the Shadow Thieves:

1. Hollowmurk Siege — draws you 1 card
2. Ant-Man, Colony Commander — makes a token
3. Earth Kingdom General — gains you that much life
4. Casey Jones, Back Alley Brute — deals that much damage
5. Shalai and Hallar — deals that much damage
6. Danny Pink — draws you 1 card
7. Enduring Scalelord — puts a +1/+1 counter on itself
8. Mikey & Leo, Chaos & Order — draws you 1 card
9. Knight of Wundagore — puts a +1/+1 counter on itself
10. Omarthis, Ghostfire Initiate — puts a counter on a permanent

51 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 (Agent of the Shadow Thieves is one).

When Agent of the Shadow Thieves is cast:

1. Hallowed Haunting — makes a token
2. Daxos the Returned — puts a counter on a permanent
3. Tatsunari, Toad Rider — makes a token
4. Sythis, Harvest's Hand — gains you 1 life
5. Sigil of the Empty Throne — makes a token
6. Dawnhart Geist — gains you 2 life
7. Herald of the Pantheon — gains you 1 life
8. Kami of Transience — puts a +1/+1 counter on itself
9. Argothian Enchantress — draws you 1 card
10. Mesa Enchantress — draws you 1 card

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 (Agent of the Shadow Thieves is one).

1. Historian's Boon — When Agent of the Shadow Thieves enters, Historian's Boon makes a token

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

When Agent of the Shadow Thieves 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. Thassa's Devourer — mills a card
9. Killian, Decisive Mentor — taps a creature
10. Thoughtrender Lamia — makes an opponent discard a card

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

anything gets a counter — 4,415 cards in the game can cause this (Agent of the Shadow Thieves is one).

1. All Will Be One — When a creature gets a counter thanks to Agent of the Shadow Thieves, All Will Be One deals that much damage

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

anything enters the battlefield — 26,499 cards in the game can cause this (Agent of the Shadow Thieves is one).

1. Nature's Wrath — When Agent of the Shadow Thieves enters, Nature's Wrath makes a player sacrifice a Swamp or permanent

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