Karlach, Tiefling Guardian

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, another target creature you control gets +4/+4 until end of turn.

Not legal in Commander

View Karlach, Tiefling Guardian on Scryfall