I'm pretty sure namine was the source of the mind altering and nothing more. teh cards were probably something random that Marluxia made up for the castle. why? does it make any sense? no, but it makes for a fun battle system for the spin off game.
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Namine caused the memory rearangement.
However, the rooms changing into memories indeed is Castle Oblivion's own power, as stated in the Secret Ansem Reports. As well as the card based battle system that's neccesary within Castle Oblivion.