Angron, Traitor Primarch

Trample, Menace Angron, Traitor Primarch must attack each turn if able When Angron, Traitor Primarch enters, sacrifice a creature. Each time Angron attacks, you may sacrifice a creature. If you do, put a +1/+1 counter on Angron, Traitor Primarch When Angron, Traitor Primarch leaves the battlefield, transform him and return him to the battlefield