Befoul

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

Phyrexian Rager

When Phyrexian Rager enters, you draw a card and you lose 1 life.

Doom Blade

Chittering Rats

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

Swamp

Disfigure

Target creature gets -2/-2 until end of turn.

Geth's Verdict

Target player sacrifices a creature of their choice and loses 1 life.

Sign in Blood

Target player draws two cards and loses 2 life.

Wrench Mind

Target player discards two cards unless they discard an artifact card.

Echoing Decay

Target creature and all other creatures with the same name as that creature get -2/-2 until end of turn.

Barren Moor

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

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.

Dark Ritual

Bojuka Bog

Bojuka Bog enters tapped.
When Bojuka Bog enters, exile target player's graveyard.
{T}: Add {B}.

Choking Sands

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

Skullsnatcher

Ninjutsu {B} ({B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Skullsnatcher deals combat damage to a player, exile up to two target cards from that player's graveyard.

Liliana's Specter

Flying
When Liliana's Specter 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.

Divest

Target player reveals their hand. You choose an artifact or creature card from it. That player discards that card.

Okiba-Gang Shinobi

Ninjutsu {3}{B} ({3}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Okiba-Gang Shinobi deals combat damage to a player, that player discards two cards.

Ravenous Rats

When Ravenous Rats enters, target opponent discards a card.

Grasp of Darkness

Target creature gets -4/-4 until end of turn.

Duress

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.