I love and own a copy of Cards Against Humanity, will soon be getting a set of two decks for Adventure Time's Card Wars and backed Legendary Showdown on kickstarter which is based on the Dr.McNinja universe. Really loved Yu-gi-oh when I was a kid but fell out of it, pokemon was neat too. Of course there's also regular card games, I learned how to play cribbage today
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Edited by Progo: 4/2/2014 6:28:55 PMMagic the Gathering, I just shelled out $65 and bought a sliver deck card-by-card, it's gonna be hard to beat :D (I have 5 other decks, I could assemble about 3 more decent ones, beyond that I lack the rares to make anything other than nub decks)