The Touch (1983)
Reasons:
1) A young Kevin Costner co-stars and is eventually murdered around 3/4ths of the movie.
2) A casino manager strips to his briefs in hopes of having sex while a team of card sharks get away with over $600,000.
3) A lady card shark dresses like a man to play casino blackjack and uses clairvoyance to win big.
This movie was originally called Stacy's Knights and has a 17% audience score on Rotten Tomatoes. The movie is available to watch as an Amazon Prime video under the title, The Touch.
The movie is listed as the sixth credit for Kevin Costner on IMDB as Stacy's Knights. The Kevin Costner image on the new cover is of an older Kevin Costner then in the movie.