Foster

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

1. Hallowed Haunting — When Foster is cast, Hallowed Haunting makes a token
2. Daxos the Returned — When Foster is cast, Daxos the Returned puts a counter on a permanent
3. Tatsunari, Toad Rider — When Foster is cast, Tatsunari, Toad Rider makes a token
4. Sythis, Harvest's Hand — When Foster is cast, Sythis, Harvest's Hand gains you 1 life
5. Sigil of the Empty Throne — When Foster is cast, Sigil of the Empty Throne makes a token
6. Dawnhart Geist — When Foster is cast, Dawnhart Geist gains you 2 life
7. Herald of the Pantheon — When Foster is cast, Herald of the Pantheon gains you 1 life
8. Kami of Transience — When Foster is cast, Kami of Transience puts a +1/+1 counter on itself
9. Argothian Enchantress — When Foster is cast, Argothian Enchantress draws you 1 card
10. Mesa Enchantress — When Foster is cast, 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 (Foster is one).

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

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

1. Calix, Guided by Fate — When Foster enters, Calix, Guided by Fate puts a counter on a creature
2. Elvish Archivist — When Foster enters, Elvish Archivist draws you 1 card
3. Victor, Valgavoth's Seneschal — When Foster enters, Victor, Valgavoth's Seneschal surveils
4. Strength from the Fallen — When Foster enters, Strength from the Fallen gives +X/+X, where X is the number of creature cards in your graveyard
5. Doomwake Giant — When Foster enters, Doomwake Giant shrinks a creature by -1/-1
6. Cacophony Unleashed — When Foster enters, Cacophony Unleashed turns something into a creature
7. Ghostly Dancers — When Foster enters, Ghostly Dancers makes a token
8. Thassa's Devourer — When Foster enters, Thassa's Devourer mills a card
9. Killian, Decisive Mentor — When Foster enters, Killian, Decisive Mentor taps a creature
10. Thoughtrender Lamia — When Foster enters, Thoughtrender Lamia makes an opponent discard a card

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

a card in a graveyard — 7,589 cards in the game can cause this (Foster is one).

1. Samwise Gamgee — Foster puts cards into the graveyard that Samwise Gamgee can bring back
2. Bloodbond March — Foster puts cards into the graveyard that Bloodbond March can bring back
3. Gale, Waterdeep Prodigy — Foster puts cards into the graveyard that Gale, Waterdeep Prodigy can bring back
4. Harness the Storm — Foster puts cards into the graveyard that Harness the Storm can bring back
5. Transplant Theorist — Foster puts cards into the graveyard that Transplant Theorist can bring back
6. Heart-Shaped Herb — Foster puts cards into the graveyard that Heart-Shaped Herb can bring back
7. Wayward Angel — Foster fills your graveyard toward the 7 or more cards Wayward Angel needs
8. Rescue from the Underworld — Foster puts cards into the graveyard that Rescue from the Underworld can bring back
9. Victimize — Foster puts cards into the graveyard that Victimize can bring back
10. Sidequest: Card Collection // Magicked Card — Foster fills your graveyard toward the 8 or more cards Sidequest: Card Collection // Magicked Card needs

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

anything goes to a graveyard — 7,589 cards in the game can cause this (Foster is one).

When a card hits the graveyard thanks to Foster:

1. Quest for Ancient Secrets — puts a quest counter on itself
2. Planar Void — hits a graveyard
3. Measure of Wickedness — gives an opponent control of itself
4. Energy Field — sacrifices itself

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