Bitcoincasino.io offers a bonus on your second deposit as well.
When you make your second deposit of at least 1 mBTC or more, you get a match deposit bonus of 50% UP TO 0.1 BTC/ 10 ETH/ 10 BCH/ 25 LTC/ 2,500.000 DOGE/ 9000 USDT. The minimum qualifying deposit to claim the bonus is 0.001 BTC.