I was just thinking about this today. It would be really cool to implement a type of strategic card game to be played in-game. The game would have to be designed so that there wasn\\\\'t just OPed cards that you could buy to be the best. Perhaps they can be dungeon drops, giving some reason to run new hard-mode dungeons (because it certainly isn\\\\\\'t for the gear).

Maybe you could accumulate "win" tokens to later spend on new mounts, cards, interesting looking gear (not for stats but for glamor).

They game would be at its best if it was 3-5 minutes long, maybe have a certain amount of time for your next move to keep the game moving. A deck would probably consist of 10 cards and it could be interesting if you could only hold a max of 15 tops. I could see this being played when your waiting for a party, maybe in a dungeon after a party member has bailed and you\\\\\\'re waiting on a replacement.