Unsure how to title this, but I do think it's a pretty good idea nonetheless.
I think that there should be a card that allows the use of one opponent's creatures ability for the turn it's played.
I wasn't sure what the cost or element should be. It felt aetherlike, but I wasn't sure. Maybe there could be more added to this idea as well - Something built onto it.
Also, while I was thinking about this idea, another popped in my head, but I feel like it has probably been brought up -- A creature that copies another creature's skills with half the attack.
Anyways, I'd like to have a discussion about these two ideas!