You have to play his 'game.' You COULD just keep hitting him. I've defeated him that way before. But, it's like facing the Heartless "gambler" you can play his game. Push triangle to begin his game. Once you do, on the reaction commands where 'attack' 'items' 'magic' usually are, have changed to 'x's' and 'o's'. You have to click on the 'o' if you can catch it. If you can, you're not turned into a cube, and you can do more hits on him while he's thrown off. If not;cube-form. Then, when he turns into cards, you need to find 'his' card, where he's hiding. Use the right analog stick to manuever the camera to where you can see the outside of the cards. You'll see him, then go and use the reaction command on him. your welcome! byez