The Dealer only appeared in SM64 Bloopers: Casino, Cards and Chaos as a secondary character. He was the former dealer at the casino. He's dressed exactly like the Judge, John Gayham, Barbie and Bowser's Boss.
In his only appearance, Mario needs lots of coins if he doesn't want to become the dinner for the Bullies after he bought a spaghetti machine that doesn't work. Since Mario does not how to play, he starts to be stupid and that drives the dealer insane, just like the old man. Mario is losing constantly, but Luigi decides to help him. Luigi has a curse in that he always wins, making Mario happy, and making a Whomp and King Bob-omb furious. These two decide to drug Luigi, making him useless. Mario then thinks about what he should do. Mario knocks out the dealer, and replaces him. Mario’s excuse of why the dealer is absent is that he was pregnant and had to leave.