The phrase "card shark" refers to a person who is very skilled at playing cards, especially in a competitive and sometimes deceptive way. Full definition
In order to stop him from further terrorist attacks, Bond is entered into the tournament where he must defeat the notorious card shark at his own game. (bullz-eye.com)
«I spent a lot of time looking at the back of playing cards,» said Tyson, a former card shark who famously won more money betting for himself to win the Turner Prize than the prize check itself. (pacegallery.com)
Tyson, a former card shark himself, famously won more money betting he would win the Turner Prize in 2002 than he ended up receiving in actual prize money. (pacegallery.com)