Oscar, Demon God of Mud

Annihilator 4, indestructible, Hexproof, trample
On each players upkeep that player must sacrifice the creature they control with the highest power among creatures they control other than Oscar. If they cannot Oscar, Demon God of Mud deals damage equal to his power to that player
Whenever another creature dies put X +1/+1 counters on Oscar, Demon God of Mud where X is that creature's power