Karlach, Tiefling Punisher

Legendary Creature — Tiefling Barbarian4/4

First strike, haste When this card specializes from your graveyard, return it from your graveyard to the battlefield. It perpetually gains "This creature can't block." When this card specializes from any zone, you may sacrifice a creature. If you do, you draw two cards and each opponent loses 2 life.

Not legal in Commander