The best casinos for winning real money are the ones that offer actual cash, and not just prizes. Make sure you read the banking and cash transaction section of the online casino you choose. Also, be aware that various online banking options only allow you to use your credit with them for other online purchases. If you want to withdraw real cash, you need to transfer money with a method that allows actual cash (ATM) withdrawals.

here you can read about possibilities to play online 3 card poker with real money

The best is probably VIP Casino. Ultimate Casino Guide gave them 5 stars, they offer 3 card poker and a good bonus and VIP program