Swamp

Befoul

Destroy target land or nonblack creature. It can't be regenerated.

Archaeomancer

When Archaeomancer enters, return target instant or sorcery card from your graveyard to your hand.

Peat Bog

Peat Bog enters tapped with two depletion counters on it.
{T}, Remove a depletion counter from Peat Bog: Add {B}{B}. If there are no depletion counters on Peat Bog, sacrifice it.

Island

Ghostly Flicker

Exile two target artifacts, creatures, and/or lands you control, then return those cards to the battlefield under your control.

Choking Sands

Destroy target non-Swamp land. If that land was nonbasic, Choking Sands deals 2 damage to the land's controller.

Dark Ritual

Chittering Rats

When Chittering Rats enters, target opponent puts a card from their hand on top of their library.

Night's Whisper

Rancid Earth

Destroy target land.
Threshold — If seven or more cards are in your graveyard, instead destroy that land and Rancid Earth deals 1 damage to each creature and each player.

Icequake

Destroy target land. If that land was a snow land, Icequake deals 1 damage to that land's controller.