I can open casinomoons, it is a fiat based casino that does not even accept any digital currencies. To be honest, I never heard about this coin. Seems it is not a popular altcoins that's why it is hard to find gambling sites accept this coin. The cheapest coin to gamble is indeed doge and it is easy to find gambling sites that accepts doge.
Luckygames.io which is a well known site that accepts atcoins also does not accept mooncoin. So I guess there is no gambling sites accept mooncoin.