Sigil of Sleep

an Aura enters the battlefield — 1,257 cards in the game can cause this (Sigil of Sleep is one).

When Sigil of Sleep enters:

1. Tanglespan Lookout — draws you 1 card
2. Chishiro, the Shattered Blade — makes a token

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

a creature deals noncombat damage — 1,420 cards in the game can cause this.

1. Psionic Sliver — When Psionic Sliver deals noncombat damage, Sigil of Sleep triggers
2. Wolfhunter's Quiver — When a creature deals noncombat damage thanks to Wolfhunter's Quiver, Sigil of Sleep triggers

1,418 other cards cause it too. These are the ones with the most connections.

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

When Sigil of Sleep 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 (Sigil of Sleep is one).

1. Historian's Boon — When Sigil of Sleep enters, Historian's Boon makes a token

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

When Sigil of Sleep 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

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

a nontoken creature leaves the battlefield — 4,133 cards in the game can cause this (Sigil of Sleep is one).

1. Dual Nature — When a creature leaves the battlefield thanks to Sigil of Sleep, Dual Nature exiles a creature

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

a creature leaves the battlefield — 4,238 cards in the game can cause this (Sigil of Sleep is one).

When a creature leaves the battlefield thanks to Sigil of Sleep:

1. Extractor Demon — mills a card
2. Valor of the Worthy — makes a token
3. Traveling Plague — returns itself from the graveyard
4. Funeral March — makes a player sacrifice a creature

25 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 (Sigil of Sleep is one).

1. Nature's Wrath — When Sigil of Sleep enters, Nature's Wrath makes a player sacrifice an Island or permanent

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