i can imagine a really easy bossfight if his weopons are cards...so the fight begins....
Luxord/Ruxodo: "mwahahaha feel the wrath of my tiny pieces of cardboard! mwahahah"(throws card at sora)
Sora: (card hits him in teh face) "uhh are you freakin serious dude"
Luxord/Ruxodo: "mwahahaha! yes! mwahaha im old! mwahaha.... doom"
Sora:"okay..."(sora does ars arcanum luxord/ruxoda falls on teh ground groanding"my hip",and then all his cards fall on the ground and he disapears) "hey is that a... OMG it is OMG its a holographic pikachu...OMG!"
okay that was really gay but yeah, obviosly i think the card idea is gay