Pretty sure there aren't that many casinos which will accept Paypal since you can very easily purchase some BTC and withdraw the BTC and simply reverse the transaction on Paypal.

If you don't have any BTC, then your best bet is to make an account with Coinbase, which will let you fund it with a credit card. After a few days you can withdraw those funds and send to a casino.

However Coinbase doesn't allow you to deposit/withdraw to Casinos, so you need to send it to your private wallet first and then send it to a casino.

Good luck.