Terra Eternal

a land it grants abilities to — 1,237 cards in the game can cause this (Terra Eternal is one).

1. Umara Wizard // Umara Skyfalls — Terra Eternal gives Umara Wizard // Umara Skyfalls indestructible
2. Storm the Vault // Vault of Catlacan — Terra Eternal gives Storm the Vault // Vault of Catlacan indestructible
3. Sunken Palace — Terra Eternal gives Sunken Palace indestructible
4. Path of Mettle // Metzali, Tower of Triumph — Terra Eternal gives Path of Mettle // Metzali, Tower of Triumph indestructible
5. Dalkovan Encampment — Terra Eternal gives Dalkovan Encampment indestructible
6. Dowsing Dagger // Lost Vale — Terra Eternal gives Dowsing Dagger // Lost Vale indestructible
7. Dragon-Cursed Halls — Terra Eternal gives Dragon-Cursed Halls indestructible
8. Pinnacle Monk // Mystic Peak — Terra Eternal gives Pinnacle Monk // Mystic Peak indestructible
9. Blackbloom Rogue // Blackbloom Bog — Terra Eternal gives Blackbloom Rogue // Blackbloom Bog indestructible
10. Malakir Rebirth // Malakir Mire — Terra Eternal gives Malakir Rebirth // Malakir Mire indestructible

1,227 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 (Terra Eternal is one).

When Terra Eternal 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 (Terra Eternal is one).

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

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

When Terra Eternal 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.