Karlach, Fury of Avernus

Legendary Creature — Tiefling Barbarian

Whenever you attack, if it's the first combat phase of the turn, untap all attacking creatures. They gain first strike until end of turn. After this phase, there is an additional combat phase. Choose a Background (You can have a Background as a second commander.)

"I never wanted to serve Zariel. Forced to fight and fight I did."