There is a bunch of casinos that accept Master Card deposits to choose from. Master Card works just like any other credit card at an online casino. Some of them go through and some do not. The only way to know is to try your card at one of the online casinos accepting Master Card deposits. Make sure to take a look at some of the casino bonuses available so you can get some extra bankroll. Pick out one of these casinos that accept Master Card and see if it goes through.