Predatory Nightstalker

When Predatory Nightstalker enters, you may have target opponent sacrifice a creature of their choice.

Raiding Nightstalker

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

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

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

Destroy target nonartifact, nonblack creature. It can't be regenerated.

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

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

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

Return all Nightstalker permanent cards from your graveyard to the battlefield. Then destroy all Swamps you control.

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