In the Deck Edit section, go up to what looks like a Banlist dropdown and check box. Then, click that AI deck option instead of selecting from your list! Then when you want to change decks for real this time around, head over underneath where it says “deck edit” on the top right corner because all active AIs should appear if scrolling down far enough-just make sure not too many are selected at once or else things might get glitchy with their bidding process.