I'm also a fan of online casinos, and I've heard good things about Gamblorium too. Another option to consider is SpinWinCasino. While they also accept Mastercard payments, their game selection is pretty impressive, catering to both casual players and high rollers. I've found their user interface to be quite intuitive as well. Of course, it's essential to do your own research and maybe even start with smaller bets to test the waters. Online casinos can be lot of fun, but responsible gaming is key.