The black-and-gold playing cards used at Laura's casino are a real deck called Anubis, designed by Steve Minty and successfully funded through Kickstarter a year prior to the release of the show.
Much of Laura's backstory was created for this series. Including her suicidal tendencies, meeting Shadow at the casino, the casino heist being what landed Shadow in jail, and her cat dying. None of these details are mentioned in the source novel, which just says that she and Shadow were fixed up on a blind date by Robbie and Audrey.