I know it's their class and all, but you should be able to fit them into one of the 23 legal Types in some form
Even small prep mistakes during this stage can impact the final grade
A common one to see is the meme of Batman slapping Robin being used as a proxy for the card Counterspell
Verhey and Bowen mentioned there will be plenty of cards for Commander that care about rolling d20s and that doesnt even take into consideration the actual Commander products yet to be previewed
Your intended commander, Inalla, Archmage Ritualist, has a pretty decent eminence ability that allows you to create a token copy of any nontoken wizard you play, so you can hold your ground until you get the game under your control
One might think that it wouldnt be too difficult to pick a TCG binder, but there are a surprising number of different features from binder to binder