Humility

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

When Humility is cast:

1. Hallowed Haunting — makes a token
2. Sigil of the Empty Throne — makes a token
3. Enchantress's Presence — draws you 1 card
4. Secret Arcade // Dusty Parlor — puts that spell's mana value counters on a creature
5. Primeval Bounty — puts 3 counters on a creature
6. The Fantasticar — turns something into a creature
7. Shark Typhoon — makes a token
8. Presence of the Master — counters a spell
9. Blood Funnel — sacrifices a creature
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 (Humility is one).

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

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

When Humility enters:

1. Strength from the Fallen — gives +X/+X, where X is the number of creature cards in your graveyard
2. Cacophony Unleashed — turns something into a creature
3. Oath of the Ancient Wood — puts a counter on a creature
4. Boon of the Spirit Realm — puts a blessing counter on itself
5. Daxos's Torment — turns something into a creature
6. Builder's Talent — puts a counter on a creature
7. Skybind — flickers a creature, artifact, planeswalker, land or battle an opponent controls
8. Cloudstone Curio — triggers

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