Let me get this straight.
I can change into some THING, but I would only be able to hold this transformation for a limited period of time.
And most of you would choose to become gods of destruction so that you can have your humanity return to a post-apocalyptic nightmare. Repeatedly.
...You guys have no tact. At all.
I would rather choose someone who could see the future, go back in time, and write down the winning sports teams, dogs, and horses in any and all betting stations with a little note including instructions before being switched with my original persona.
Someone like, say, the main character from Braid.
Then I buy a bomb shelter, a satellite system, a private army, and several other secret bases in preparation for the coming apocalypse that you other geniuses are going to screw the world with.