Triple draw hi/lo where both sides have to actually earn it — no gimme low, no gimme high.
Button and blinds.
Five cards, three separate discard-and-replace draw rounds.
Small bet after the deal and the first draw, big bet after the last two draws.
Pot splits high/low, but both sides carry a real qualifier: at least a pair of sixes (sometimes nines, depending on the house rule) to win high, an 8-low or better to win low. If nobody clears either bar, the high hand scoops regardless of how weak it actually is.