Uncle Istvan

Prevent all damage that would be dealt to this creature by creatures.

Twisted Experiment

Enchant creature
Enchanted creature gets +3/-1.

Befoul

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

Polluted Mire

This land enters tapped.
{T}: Add {B}.
Cycling {2} ({2}, Discard this card: Draw a card.)

Expunge

Destroy target nonartifact, nonblack creature. It can't be regenerated.
Cycling {2} ({2}, Discard this card: Draw a card.)

Despoil

Destroy target land. Its controller loses 2 life.

Unearth

Return target creature card with mana value 3 or less from your graveyard to the battlefield.
Cycling {2} ({2}, Discard this card: Draw a card.)

Blood Vassal

Fog of Gnats

Swamp

Sinkhole

Spreading Rot

Unnerve

Bubbling Muck

Until end of turn, whenever a player taps a Swamp for mana, that player adds an additional {B}.

Looming Shade

{B}: This creature gets +1/+1 until end of turn.

Maw of the Mire

Exhume

Each player puts a creature card from their graveyard onto the battlefield.

Icequake

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

Desecrated Earth

Destroy target land. Its controller discards a card.

Carrion Beetles

{2}{B}, {T}: Exile up to three target cards from a single graveyard.

Dark Ritual

Slinking Skirge

Flying
{2}, Sacrifice this creature: Draw a card.

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.

Rancid Earth

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

Destroy the Evidence

Destroy target land. Its controller reveals cards from the top of their library until they reveal a land card, then puts those cards into their graveyard.

Choking Sands

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

Polluted Dead

When this creature dies, destroy target land.

Cackling Fiend

When this creature enters, each opponent discards a card.

Corrupt

Corrupt deals damage to any target equal to the number of Swamps you control. You gain life equal to the damage dealt this way.

Sleeper's Guile

Enchant creature
Enchanted creature has fear. (It can't be blocked except by artifact creatures and/or black creatures.)
When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.