The others are all chasing after their desperate dream of becoming whole once again, but Luxord knows with his gambler's instincts that that is nothing more than an exercise in futility. Everyone who makes an art of playing games of chance (of Luxord considers himself to be one of the best) knows what it feels like to have Fate closing in on you, the stakes becoming higher as your luck wears thin. The others think that they are the ones on the offensive, and that Kingdom Hearst will soon be theirs. Luxord knows that their hand is weak, and Fate is about to trump them.
Every gambler can feel it in their bones when She finally closes in, and so when he and Sora finally square off in the World That Never Was, Luxord knows that he will not be the one to walk away victorious. Still, this knowledge doesn't stop him from giving the Keybearer his cockiest grin as he summons the cards.
Let the dice fly high.