Octopus Umbra

a creature becomes tapped — 565 cards in the game can cause this (Octopus Umbra is one).

When a creature becomes tapped thanks to Octopus Umbra:

1. Unctus, Grand Metatect — draws you 1 card
2. Sharae of Numbing Depths — draws you 1 card
3. Rewrite History — draws you 1 card
4. Stinging Licid — deals 2 damage
5. Gideon's Avenger — puts a +1/+1 counter on itself
6. Icewrought Sentry — gets +2/+1
7. Hawkeye's Bow — deals 1 damage
8. Cryoshatter — kills a creature
9. Don't Move — kills a creature
10. Hylda of the Icy Crown — triggers

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

anything becomes tapped — 699 cards in the game can cause this (Octopus Umbra is one).

1. Master Pakku — When Master Pakku becomes tapped thanks to Octopus Umbra, it mills a card

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

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

When Octopus Umbra 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.

an enchantment is cast — 3,673 cards in the game can cause this (Octopus Umbra is one).

When Octopus Umbra 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 (Octopus Umbra is one).

1. Historian's Boon — When Octopus Umbra enters, Historian's Boon makes a token

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

When Octopus Umbra 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

60 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 (Octopus Umbra is one).

1. Nature's Wrath — When Octopus Umbra enters, Nature's Wrath makes a player sacrifice an Island or permanent

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