Vernal Fen

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

When Vernal Fen enters:

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

a Forest enters the battlefield — 85 cards in the game can cause this (Vernal Fen is one).

When Vernal Fen enters:

1. Titania, Nature's Force — makes a token
2. Baru, Fist of Krosa — gives +1/+1
3. Reach of Branches — returns itself from the graveyard
4. Tourach's Chant — deals 3 damage
5. Battlewand Oak — gets +2/+2
6. Staff of the Wild Magus — gains you 1 life
7. Necklace of Girion — puts a counter on a creature
8. Roiling Canopy — gives +3/+3

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

When Vernal Fen enters:

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

1. Nature's Wrath — When Vernal Fen 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.