This is played as per Texas Hold'em, but with the twist that any two or more number cards can be combined and used as if they are a single card of the combined value. The combined cards can be the player's hole cards, the community cards, or a mix of the two.
Combined cards can be used to represent
court cards (J = 11, Q = 12, K = 13). However, since A = 1, you can't combine two cards to make an Ace.
Example: A 4 and a 5 could be combined to make a pair with a 9.
Example: An A and a 9 can be combined to make a pair with a T.
Example: A 9 and a 3 can be paired to make a Queen.
Example: A player holds 4c 5h. The community cards are 8d 7d Ts Js Ah. This player has made a straight using his hole cards as a 9.
Combined cards can also be used for flushes. Of course, you'd have a flush anyway, but it could give you a slightly higher flush.
Example: The cards on the board are 3h 4h 5h 8h Qs. One player has 7h Ks. The other player has 6h 3s. This player wins because his combined cards become a 9h giving him a higher-ranking flush.
This rule probably doesn't affect the odds *too* drastically. Low number cards are more useful than before, but high number cards like 9s and 10s also become more playable, as low flops might provide combo possibilities (e.g. a flop of 4h 5c 9d means a player with a hand of K9 has made trips). Aces are also handy for obvious reasons - a player with AQ doesn't need to worry about folding if the flop brings a K, since he can pair his AQ with the K.
This rule change should lead to more action, as players will be tempted to stay in to see the flop with low cards or Ax hands.
While there's slightly more luck in this version (since there are more ways for players to suck out, strong starting hands have less of an edge over weak hands), the fact that poor players are even more likely to overplay their weak hands in this version should compensate by giving skilled players more chances to take their money.
(edited to allow cards to combine into court cards)