One of the selling points of Revolut are the low fees. In many cases transfers are also free. For example, funding the account and making transfers is free. The Revolut card costs a one-time fee, and depending on your VIP level you can also withdraw between €200 and €600 for free at any ATM that supports your card type. You can also exchange fiat currencies for free, although the account limit is €6,000 for standard accounts and premium and metal accounts have no limits.
The standard account at Revolut is free of charge and there are also the Premium and Metal accounts that offer more perks and options, including insurances.
Most casinos also don't charge fees for making deposits or withdrawals, but it's best to check the payment policy at the casino.