[damaniac]

We had something like this. Everyone got 5 cards, then (N+1)*3 cards were placed faceup in the middle (N being the number of players). After a round of betting, a player could discard a card face down on the board in place of picking one up. They also had the option of following that up by discarding another card and drawing from the top of the deck, although anyone who did so then had to go at the end of subsequent betting rounds (this option was probably unecessary). This went on for a total of 3 rounds, at the end of which hands went to showdown.

It made for some interesting strategy, sort of a game theory problem. For example, if three aces were up, and someone started taking them, it became apparent they were drawing to quads. So someone had to take an A to prevent that, but the A may well have been useless to everyone else, but of course if no one took 1 (or 2) then everyone would lose.