Graf Reaver 
Creature — Zombie Warrior
Exploit (When this creature enters, you may sacrifice a creature.) When this creature exploits a creature, destroy target planeswalker. At the beginning of your upkeep, this creature deals 1 damage to you.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL