Also called EDH or Elder Dragon Highlander, Commander is Magic's most popular format and all about picking your hero and building a deck around them. In this casual, multiplayer format, you choose a legendary creature to serve as your commander and build the rest of your 100 card deck around their color identity and unique abilities. Players are only allowed one of each card in their deck, with the exception of basic lands, but they can use cards from throughout Magic's history.
Commander combines the command zone, color identity, singleton deckbuilding, multiplayer strategies, and the entire MtG cardpool for one of the most exciting and fresh ways to play.
Read more at Commander's official website.
I'd love to play against a Claire D'Loon deck, though to be fair I'm down for acorn commanders in general.
Have you given any thought to how you're handling the tokens? Shuffling a bunch token copies of various creatures into your deck could get messy.
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.