My favourite Gambler scenes:

Father teachers daughter the art of switching cards with only a lock of hair. Later in the movie, she actually was able to do that with armed guards around the table and the cards were covered with covers on them. The guy who had their card changed won several billion in the process.

My other favourite was when a guy betted his hand (used to cheat) and lost it. At the end of the series he makes a glorious comeback, with another hand.