This would definately be tricky to code, but would definately bring people togther for games, and create some more cashflow/rp by gambling.
you could start by making the 'deck' not auctially 52 seperate cards, but a random card generator, and set it up so the same cards could not be dealt in the same 'hand'... I dunno I guess coding would probibaly be a bitch.
how was it handeled in the old casino?
also is the casino planning to be reopened any time soon?
maybe an individual gambling machine in a bar, or the super happy arcade on green.
or a gambling table with certan spots you sit at with monitors all ran by a computer,
who knows, but gambling is something that is definately cp, and definately would enhance the game.