The online gaming web sites have largely stopped doing business with any form of payment that involves American banks. That includes credit cards and debit cards. If you run into a site that allows the use of a credit card for payment, I would be careful.
My advice is don't be so desparate to play online that you abandon common sense and patronize web sites that have stiffed people in the past. (Like the common one that I and others warn about all the time. Even though some people choose to do business there, I would strongly advise against it.)