Swamp

a Swamp enters the battlefield — 63 cards in the game can cause this (Swamp is one).

1. Thelon's Chant — When Swamp enters, Thelon's Chant deals 3 damage
2. Veilborn Ghoul — When Swamp enters, Veilborn Ghoul returns itself from the graveyard
3. Staff of the Death Magus — When Swamp enters, Staff of the Death Magus gains you 1 life
4. Dread Presence — When Swamp enters, Dread Presence triggers

a land enters the battlefield — 1,560 cards in the game can cause this (Swamp is one).

1. Primeval Bounty — When Swamp enters, Primeval Bounty gains you 3 life
2. Toph, Earthbending Master — When Swamp enters, Toph, Earthbending Master puts a counter on a permanent
3. Dancing from Dark to Dawn — When Swamp enters, Dancing from Dark to Dawn makes a token
4. Emeria Shepherd — When Swamp enters, Emeria Shepherd brings a card back
5. Quest for the Necropolis — When Swamp enters, Quest for the Necropolis puts a quest counter on itself
6. Soul Stair Expedition — When Swamp enters, Soul Stair Expedition puts a quest counter on itself
7. Nissa of Shadowed Boughs — When Swamp enters, Nissa of Shadowed Boughs puts counters on a permanent
8. Thranduil, Sindarin Liege // Silvan Rally — When Swamp enters, Thranduil, Sindarin Liege // Silvan Rally makes a token
9. Silvan Reveler — When Swamp enters, Silvan Reveler returns itself from the graveyard
10. Floral Evoker — When Swamp enters, Floral Evoker puts a +1/+1 counter on itself

199 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 (Swamp is one).

1. Nature's Wrath — When Swamp enters, Nature's Wrath makes a player sacrifice a Swamp or permanent

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