you should have a full hp and 1600cp...put many zeros,eight and nine keyblades...the magic cards that you will put is aero put 4aeros so you can aeroga twice and 4cure so you can curaga twice put a for the items put any kind of potion(I used ordinary potion bcoz the number is nine)and for the summon cards put 4 clouds to do omnislash twice...put the zero keyblades on the first place next put the keyblades eight first the nine,put the 4aero,4cloud,4cure then the potion...skip all the zeros and atk marluxia w/ eight and nine cards then go near him and use aero then cloud then if he will use a sleight just press R then a so you can break it then if your life is near the green bar only use cura butif your health is in the green bar use curaga the enemy cards that I use is vexen,larxene and search ghost if I die I will resurrect and use the search ghost so I can drain him and use larxene to dodge the attacks....wish I helped you,you can remove larxene in the deck XD