Flying, menace

Whenever Bearstine, Fire of Desire attacks, defending player may sacrifice five permanents. If they do not, Bearstine, Fire of Desire gains +15/+15 until end of turn.

Next Step - At the end of your turn, if creatures you control have a combined power of 30 or more, remove Bearstine, Fire of Desirefrom the game. Bearstine, Dragon God is your new commander.