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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Black jack for it's risk taking, bullshit using your mind and gut to guess if someone's lying or using reverse psychology and our current game egyptian war using speed, instinct, sacrifice and risk taking to win