Well of Ideas

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

When Well of Ideas 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 (Well of Ideas is one).

1. Historian's Boon — When Well of Ideas enters, Historian's Boon makes a token

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

When Well of Ideas 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.

a card is drawn — 3,815 cards in the game can cause this (Well of Ideas is one).

When Well of Ideas makes a player draw a card:

1. Teferi's Tutelage — mills a card
2. Temmet, Naktamun's Will — gives +1/+1
3. Niv-Mizzet, Parun — deals 1 damage
4. Aether Syphon — mills a card
5. Ob Nixilis, the Hate-Twisted — deals 1 damage
6. The Locust God — makes a token
7. Starving Revenant — makes each opponent lose 1 life
8. Diviner's Wand — gets +1/+1
9. Ominous Seas — puts a foreshadow counter on itself
10. Dream Trawler — gets +1/+0

57 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 (Well of Ideas is one).

1. Nature's Wrath — When Well of Ideas 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.