All for a TCG. Played quite a few for some time. Obvioulsy MTG (everyone's played that) Yu-Gi-Oh, Duel Masters (anyone else remeber this? Anyone?), Lunch Money, Munchkin, Kittens in aBlender, the list goes on. Tons of card games.
Be more than willing to help. So long as it's a little more origional, and not just a MTG or YuGiOh rip off.