When he attacks you with cards use the reaction command to flip them and get closer to him. Then a reaction command for Luxord comes up called Play Game. Use that. Your attack menu becomes a roulette wheel and you have to press X when a circle is highlighted. Press X when a Circle is highlighted and he will stop drop health orbs. He also won't move for a while so attack him while he's stopped. The quicker you hit X on the circle the longer he stays stopped for.
