Here's something interesting I found while battling against one of my friends. Obviously, this can only work through the game link cable between two Game Boy Advances with the KH:CoM game paks (with one of your Sora files beaten in each pak), but I'll just point that out if you didn't know.

Procedure

1. One of you must have Parasite Cage (Dispel) enemy card in you deck while your opponent must have the Marluxia (Double Sleight) enemy card, and also any cards that would make at least a named sleight for the person with the Marluxia card. Both of you could have both the cards in each deck if you would like to do it again, but you need at least cards of at least two sleights to do so.

2. Once your in battle with your oppenent, the player with the Marluxia enemy card must have that card activated while setting up the named sleight.

3. Activate the sleight. While that sleight is happening, the player with the Parasite Cage must activate it in duration of the sleight or the glitch will not work.

Result
The sleight'll just keep repeating itself over and over again! Tad neat, huh? For example, if I play a Omislash sleight with a Marluxia card activated in battle, my opponent could activate his Parasite Cage and, unfortunately, instead of cancelling the sleight, gets pummeled from Cloud's Buster Sword again and again and again!

Yeah, I was real surprised when me and my friend happen to come across that situation. Unfortunately, I was the one who did the Parasite Cage. xp

Edit: Sorry, I do know that this doesn't belong here. This couldn't possibly be used to one's advantage; besides, it would be a cheap win against an unsuspecting player. I would be thankful if someone would move this to the Discussion subforum. Sorry if it's going to be a hassle.