lol, i beat Riku at level 65. Have lots of high level cards, some cures, and powerful sleights ofcourse. but not too many sleights, that cards that are valuable will run out eventually, i used up my whole deck from sleights, and that only 2 cards that didn't go away were a level 7 cure and a level 7 kingdom key attack card! I took his last life bar with them two cards.