Nightstalker Engine

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

Predatory Nightstalker

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

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

This creature can't be blocked except by black creatures.

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

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

Whenever this creature attacks, it gets +2/+0 until end of turn.

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

Whenever this creature attacks and isn't blocked, defending player discards a card.

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