Alexios, Deimos of Kosmos (ACR 33)

Legendary Creature — Human Berserker • Mana cost: {3}{R} • Assassin's Creed • Uncommon

Trample
Alexios attacks each combat if able, can't be sacrificed, and can't attack its owner.
At the beginning of each player's upkeep, that player gains control of Alexios, untaps it, and puts a +1/+1 counter on it. It gains haste until end of turn.

Illustrated by Bartek Fedyczak.