A bit wordy. Nice idea; always Clone and a boost of Control Magic if you have done the thing the set wants you to do.

The two issues I can see - will the opponent have anything worth stealing, since the set is pushing you into using lots of sorcereis? And if they do; will it be the only thing and that's game-over?

And secondly - just raw power level. This is slightly expensive for a clone; but cheap for a theft. And it will do both. Unless that's meant to be an 'instead' clause? That makes more sense power-wise but is way less interesting a card.

To me it would seem tempting to just reuse Spell mastery instead of creating a new one. Is the difference of having three of those types of cards in your graveyard instead of two really worth making a new ability word?

@tahazzar, i didnt acutally now about spellmastery, i will expand on this.

@Vitenka , i will playtest the powerlevel. I see it as more of a sideboard for control if anything. Since Reincarnate exist they can always kill their creatures and return them back to themself later.

and the renown creatures and whatever arent that big.

if you have read it since i change the control magic to cmc 3 instead for balance.

I think you overshot the mark a bit. You've gone from "Huh, that's interesting, maybe a bit too good and maybe not, and numbers can be tweaked" right to "Junk rare" in one bold step :)