Huxtropy (2009)

From publisher blurb:

Long ago, a trickster gypsy named Felavusix fooled four powerful entities from the Elemental Chaos into an endless game of cards. Having trapped them, he enacted a ritual to draw their elemental power into his own cards. Learn to wield the huxtropy deck as an arcane implement, or as a weapon using an actual deck of cards for damage (instead of dice!)

With feats, a ranger reskin known as the deckslinger, the gamblers pact warlock, and a new paragon path, Huxtropy includes everything you need to play a card-wielding character. You'll also find backstory for the elemental gamblers, rules to play the actual gambling game of huxtropy, how to read a fortune with a huxtropy deck, and more.