If I lost a game to Battle of Wits in a format where you legally can’t even put that many cards in your deck, I’d be telling people that story for years.

I’m anti-Un-cards as a rule, but as long as you have a plan for managing the tokens, Claire seems like one of the less offensive ones. At least she doesn’t make you repeat a dumb phrase or take off your shoes. As is often the case in Commander, it’s a matter of what you can get your playgroup to agree to, but personally I’d agree to this.