What would be nice to really be able to play anything with it, would be a selection of used cards. That would mean for example choosing if the deck goes from Ace to King, or from 7 to King, or even if it contains jokers. Even more advanced would be allowing multiple copies of cards, the game Doppelkopf for example is commonly played with two cards each of (9)/10/J/Q/K/A for every suit.