This idea is already in the game, if you are level 50+ and in Celestia you will have access to training the moon school which does the exact thing you were saying. If not you will get there soon. NEVER give up! :)
I'm already done with Celestia, and that is different. Those spells can transform you into any monster, when these spells can transform you into your enemy.
Clone spells are not the same thing as polymorphs, polymorph turn you into a monster with that schools spells.How you described the clone spells,TOATTLY a difreant thing.