Undercity Sewers

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

When Undercity Sewers 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

an Island enters the battlefield — 64 cards in the game can cause this (Undercity Sewers is one).

1. Staff of the Mind Magus — When Undercity Sewers enters, Staff of the Mind Magus gains you 1 life

you surveil — 233 cards in the game can cause this (Undercity Sewers is one).

When Undercity Sewers surveils:

1. Mirko, Obsessive Theorist — puts a +1/+1 counter on itself
2. Prudent Fateseer // Peer Review — gives +1/+0
3. Diviner of Victory // Unwind History — gets +1/+1
4. Saheeli, Consul of Oversight — makes a token
5. Copy Catchers — makes a token
6. Proft, Consulting Detective — puts a +1/+1 counter on itself
7. Matoya, Archon Elder — draws you 1 card
8. Denzilore Fatehold — puts a counter on a creature
9. Whispering Snitch — deals 1 damage
10. Blood Operative — makes you lose life

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

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

When Undercity Sewers 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.

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

1. Samwise Gamgee — Undercity Sewers puts cards into the graveyard that Samwise Gamgee can bring back
2. Bloodbond March — Undercity Sewers puts cards into the graveyard that Bloodbond March can bring back
3. Thor, God of Thunder — Undercity Sewers puts cards into the graveyard that Thor, God of Thunder can bring back
4. Gale, Waterdeep Prodigy — Undercity Sewers puts cards into the graveyard that Gale, Waterdeep Prodigy can bring back
5. Harness the Storm — Undercity Sewers puts cards into the graveyard that Harness the Storm can bring back
6. Transplant Theorist — Undercity Sewers puts cards into the graveyard that Transplant Theorist can bring back
7. Heart-Shaped Herb — Undercity Sewers puts cards into the graveyard that Heart-Shaped Herb can bring back
8. Wayward Angel — Undercity Sewers fills your graveyard toward the 7 or more cards Wayward Angel needs
9. Rescue from the Underworld — Undercity Sewers puts cards into the graveyard that Rescue from the Underworld can bring back
10. Victimize — Undercity Sewers puts cards into the graveyard that Victimize can bring back

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 (Undercity Sewers is one).

When a card hits the graveyard thanks to Undercity Sewers:

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.

anything enters the battlefield — 26,499 cards in the game can cause this (Undercity Sewers is one).

1. Nature's Wrath — When Undercity Sewers enters, Nature's Wrath makes a player sacrifice an Island or permanent

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