Darkness

Prevent all combat damage that would be dealt this turn.

Nightshade Stinger

Sinister Strength

Enchant creature
Enchanted creature gets +3/+1 and is black.

Clawing Torment

Enchant artifact or creature
As long as enchanted permanent is a creature, it gets -1/-1 and can't block.
Enchanted permanent has "At the beginning of your upkeep, you lose 1 life."

Vampire Interloper

Tragic Slip

Target creature gets -1/-1 until end of turn.
Morbid — That creature gets -13/-13 until end of turn instead if a creature died this turn.

Forever Young

Put any number of target creature cards from your graveyard on top of your library.
Draw a card.

Diabolic Edict

Target player sacrifices a creature of their choice.

Swamp

Go for the Throat

Sign in Blood

Target player draws two cards and loses 2 life.

Changeling Outcast

Changeling (This card is every creature type.)
Changeling Outcast can't block and can't be blocked.

Geth's Verdict

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

Tormented Soul

Tormented Soul can't block and can't be blocked.

Unholy Strength

Enchant creature
Enchanted creature gets +2/+1.

Carrion Feeder

Carrion Feeder can't block.
Sacrifice a creature: Put a +1/+1 counter on Carrion Feeder.

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.)