Echoing Decay

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

Gray Merchant of Asphodel

When this creature enters, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)

Cast Down

Duress

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

Swamp

Thorn of the Black Rose

Deathtouch
When this creature enters, you become the monarch.

Chittering Rats

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

Bojuka Bog

This land enters tapped.
When this land enters, exile target player's graveyard.
{T}: Add {B}.

Diabolic Edict

Target player sacrifices a creature of their choice.

Sign in Blood

Target player draws two cards and loses 2 life.

Troll of Khazad-dûm

This creature can't be blocked except by three or more creatures.
Swampcycling {1} ({1}, Discard this card: Search your library for a Swamp card, reveal it, put it into your hand, then shuffle.)

Gurmag Angler

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

Extract a Confession

As an additional cost to cast this spell, you may collect evidence 6. (Exile cards with total mana value 6 or greater from your graveyard.)
Each opponent sacrifices a creature of their choice. If evidence was collected, instead each opponent sacrifices a creature with the greatest power among creatures they control.

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.

Bone Picker

This spell costs {3} less to cast if a creature died this turn.
Flying, deathtouch

Dusk Legion Zealot

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

Phyrexian Rager

Defile

Target creature gets -1/-1 until end of turn for each Swamp you control.

Exhume

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

Darkness

Prevent all combat damage that would be dealt this turn.

Cuombajj Witches

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