Most online casinos offer bonuses and rewards for new and existing players. But players must often make a minimum deposit to claim the bonus, although that's not the case with no-deposit bonuses. And one way to make a qualifying deposit is through Mastercard. This payment card is one of the most widely accepted casino banking methods supporting deposits and withdrawals. So, in this article, you'll learn how to claim bonuses and rewards at the best casinos that accept Mastercard deposits and some tips to make the most of these rewards.