Gatekeeper of Malakir

Kicker {B} (You may pay an additional {B} as you cast this spell.)
When this creature enters, if it was kicked, target player sacrifices a creature of their choice.

Dark Confidant

At the beginning of your upkeep, reveal the top card of your library and put that card into your hand. You lose life equal to its mana value.

Gifted Aetherborn

Swamp

Kalakscion, Hunger Tyrant

Grief

Menace
When this creature enters, target opponent reveals their hand. You choose a nonland card from it. That player discards that card.
Evoke—Exile a black card from your hand.

Bitter Triumph

As an additional cost to cast this spell, discard a card or pay 3 life.
Destroy target creature or planeswalker.

Dark Ritual

Diregraf Ghoul

Diminished Returner

Diminished Returner enters tapped.
{B}{B}: Diminished Returner perpetually gets -1/-1, then return it to the battlefield. Activate only if Diminished Returner is in your graveyard and its toughness is 2 or greater.

Chrome Mox

Imprint — When this artifact enters, you may exile a nonartifact, nonland card from your hand.
{T}: Add one mana of any of the exiled card's colors.