God Damn It, Zach!

Destroy all creatures, then exile this spell with 3 Setback counters.
At the beginning of your upkeep, remove a Setback counter from God Damn it, Zach!, then destroy all creatures. (When all counters are removed, the spell is put into the graveyard.)
"What do you gain out of this?! It was a 0/2 with defender!"