In case you don't know, Kongai is a 'collectible card game' that actually plays like Pokemon crossed with street fighter. You choose a 'deck' of three cards (it's more like a 3 man tag team in games like MvC2 and stuff) and then play. The actual gameplay is a very very advanced version of rock/paper/scissors, except a lot more fun than that.
I managed to get someone else hooked by playing one game with him.