Angron, Traitor Primarch

Menace Whenever Angron, Traitor Primarch enters or attacks, you may sacrafice another creature. If you do, put a +1/+0 counter on Angron Should Angron leave the battlefield due to a spell it’s controller cast, flip him {flavor} Did the Emperor teleport his gold-wrapped Custodians down to help me and my army? Did he free the War Hounds and order them to battle, fight alongside me? No and no. No mercy for Angron. Angron the Oathbreaker. Angron the Betrayer.” - Angron