Sooo basically, both hands and quanta pools are open for either person to use?
Seems like a gateway to havoc and mayhem.
I'd personally divorce this effect from the creature, make it a permanent (or spell depending on how powerful the effect is.), and have another card that causes quanta sources to activate at the end of any turn, basically boosting quanta production beyond most methods of control, possibly.
Intriguing idea, I must say, and yet another one that could have incredible effects on the metagame in general.