Back to the original theme of insufficiently controlled power.

­:) I like it. Unfortunately there aren't many cases which will cause the creature to not be exiled, as most of them will cause this spell to be countered. How about adding "~ can't be countered"? That way if someone (even you) bounces or flickers the target, you get the big boom. As it is now it'll be countered on resolution.

I was thinking things that come back from exile, mainly. Not sure I like it going big-boom if it's just mistargeted.

I don't think there's anything that would come back from exile automatically, in the middle of the resolution of another spell...

Commanders?

The way I'm reading this, if the creature is destructible, it passes the first conditional and won't set it off, but then it's obviously not in exile so you get to damn the board. Is that supposed to happen?

No, it's supposed to try each one in turn and stop when one succeeds. Edited for clarity, I hope.

Ah, yes, Commanders can find themselves not in the exile zone after being exiled. Cunning. Not actually "coming back from exile", at least not in the timescale of this spell's resolution, but yes, there is one rule in one format that can cause the third clause to happen. None outside of EDH that I can think of though, but it's certainly possible I've missed something else.

I thought it was more common, but I may be misremembering. The "Kill it. Then EXILE IT." will trigger a lot more often, and feels a lot more satisfying than "Exile it" even though it achieves the same effect 99% of the time.