MTG

Destroy all creatures target opponent controls. You lose 2 life for each creature destroyed this way.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Prowling Nightstalker can't be blocked except by black creatures.

When Predatory Nightstalker enters the battlefield, you may have target opponent sacrifice a creature.

Nightstalker Engine's power is equal to the number of creature cards in your graveyard.

Flying When Angel of Mercy enters the battlefield, you gain 3 life.

Flying

Target player discards two cards.

Whenever Lurking Nightstalker attacks, it gets +2/+0 until end of turn.

Kiss of Death deals 4 damage to target opponent or planeswalker. You gain 4 life.

When Hidden Horror enters the battlefield, sacrifice it unless you discard a creature card.

Destroy target nonblack creature.

Flying When Foul Spirit enters the battlefield, sacrifice a land.

Destroy target nonblack creature. You gain 3 life.

Target opponent sacrifices a creature.

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

Creatures you control get +1/+0 until end of turn.

When Brutal Nightstalker enters the battlefield, you may have target opponent discard a card.

Target creature gets +X/+0 until end of turn.

You draw three cards and you lose 3 life.

Whenever Abyssal Nightstalker attacks and isn't blocked, defending player discards a card.

One or two target creatures gain flying until end of turn.

When Alaborn Zealot blocks a creature, destroy that creature and Alaborn Zealot.