RONKER, Forever Nervous

Flying, Haste, Trample

At the beginning of your upkeep, sacrifice another creature. RONKER deals damage equal to that creature’s power to any target and you create four Treasure tokens. If you don't: sacrifice RONKER.
At the beginning of each opponent’s upkeep, RONKER deals 2 damage to that player unless they sacrifice a creature of their choice.

Sacrifice four creatures you control:RONKER gains indestructible until the end of turn.