Pestilence

At the beginning of the end step, if no creatures are on the battlefield, sacrifice this enchantment.
{B}: This enchantment deals 1 damage to each creature and each player.

Diabolic Edict

Target player sacrifices a creature of their choice.

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.

Sign in Blood

Target player draws two cards and loses 2 life.

Icequake

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

Chittering Rats

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

Peat Bog

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

Nausea

All creatures get -1/-1 until end of turn.

Night's Whisper

Befoul

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

Tendrils of Corruption

Tendrils of Corruption deals X damage to target creature and you gain X life, where X is the number of Swamps you control.

Snuff Out

If you control a Swamp, you may pay 4 life rather than pay this spell's mana cost.
Destroy target nonblack creature. It can't be regenerated.

Dark Ritual

Cuombajj Witches

{T}: This creature deals 1 damage to any target and 1 damage to any target of an opponent's choice.

Thorn of the Black Rose

Deathtouch
When this creature enters, you become the monarch.

Choking Sands

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

Doom Blade

Dusk Legion Zealot

When this creature enters, you draw a card and you lose 1 life.

Gurmag Angler

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)

Radiant Fountain

When this land enters, you gain 2 life.
{T}: Add {C}.

Swamp

Barren Moor

This land enters tapped.
{T}: Add {B}.
Cycling {B} ({B}, Discard this card: Draw a card.)