Sign in Blood

Target player draws two cards and loses 2 life.

Swamp

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

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

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

Flying
When Liliana's Specter enters, each opponent discards a card.

Creatures target player controls get -2/-2 until end of turn.

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

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

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

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

When Ravenous Rats enters, target opponent discards a card.

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

Creatures your opponents control get -1/-1 until end of turn.
Cycling {2} ({2}, Discard this card: Draw a card.)

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

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

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