Common Cause

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

When Common Cause 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 (Common Cause is one).

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

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

When Common Cause 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

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

a creature it boosts — 19,392 cards in the game can cause this (Common Cause is one).

1. Pollywog Prodigy — Common Cause gives Pollywog Prodigy bigger stats
2. Havengul Lich — Common Cause gives Havengul Lich bigger stats
3. Saheeli, Radiant Creator — Common Cause gives Saheeli, Radiant Creator bigger stats
4. Captain Jean-Luc Picard — Common Cause gives Captain Jean-Luc Picard bigger stats
5. Windrider Wizard — Common Cause gives Windrider Wizard bigger stats
6. Master of Winds — Common Cause gives Master of Winds bigger stats
7. Sokka, Bold Boomeranger — Common Cause gives Sokka, Bold Boomeranger bigger stats
8. Invisible Woman — Common Cause gives Invisible Woman bigger stats
9. Rockslide Sorcerer — Common Cause gives Rockslide Sorcerer bigger stats
10. Umara Wizard // Umara Skyfalls — Common Cause gives Umara Wizard // Umara Skyfalls bigger stats

19,382 other cards care about it too. These are the ones with the most connections.