"Only one permanent per turn" feels like saying Butterfly Effect is weak because it only allows one destruction per turn. Especially considering the low up-front cost... It's five gravity the first turn, but it's fairly easy to maintain, considering the strength of the monsters that would probably be involved. Either huge HP, or in the case of flying titans, you have momentum, which means it's pretty much automatic.
I agree that one perm max per monster seems more reasonable, if that's what you mean by it not being stackable. Otherwise, it will have the tendency to quickly spiral out of control. Weird interactions with Adrenalin could still ensue.
Just a thought, but what if the card itself could be used to destroy something every turn, but only if there was a high HP creature out or something? Or, instead of the quantum drain, it requires a high HP creature or it self-destructs?