i see you removed the number of elemental bolts/day.. does it mean you can use it at will?

and, if i'm not mistaken, there's no such thing as "air" or "earth" damage in D&D.. the energy types are fire, cold, electricity, sonic, force...

anyway i was just suggesting that you focused a bit more on the clone ability: it sounds nice and could be improved.. if you remove the "bonus feat every other level" you can create gaps you can fill with more abilities:
i was thinking mainly of the clone:
clone 1) only runs and explodes
clone 2) can infiltrate, you see through his eyes, can deliver a touch spell or explode
clone 3) can go to other planes

and, you could give 3-4 element-specific abilities:
ELEment specific 1) if you chose FIRE then x, if you chose cold then y, etc
element specific 2) if you chose fire
etc

just find abilities with roughly the same power (i can think of the Fire ability to give FLAMING enhancement to your weapon, or the Air ability to give you a fly speed...)

just a couple of things that popped to mind ^^