Cards speak for themselves. The player keeps all seven cards at the end and chooses which to turn up. This allows the player to change from hi to lo depending on what is being played. Pass 2 cards to the left and 1 card to the right at the same time. Threes are wild if and only if the hand they are in is used to try to win the high pot.
Kings are wild if and only if the hand they are in is used to try for the low pot.
No betting until the showdown. High is usually won by at least a full house. If someone has such a hand, they must open the betting. If nobody can open, the hand is discarded, everyone antes again, and hands are redealt. Once the betting is opened play continues as in 5 Card Draw until the showdown.