It is a shame that this card didn't get an additional 1/1. As a 5/3 this would be great in combination with Spellbreaker Behemoth. That combo would have been even better with asceticism.

Too bad your opponent may tap their mana in respons to this ability to charge their doom blade or lightning bolt. But I guess that is also the one thing that keeps this from being overpowered.

Great concept that will create a very special style of gameplay.