Would the rings copy a planeswalkers ability? Like if I used Jace's ultimate to make myself draw 20 cards, could I use the rings to double it?
No, I am not a judge. That's why I like to quote sources such as the rules that trump judges.
oh, this is for commander though. and I'm not worried about decking myself, i use niv-mizzet and psychosis crawlers for kill cards. Also, psychic possessions. I'm happy to know that the rings work with jace. This is going to be fun.