My suggestion is safedice.com
I have invested there and played also, they have only a small money pot, so if you area planning to invest big then you will have a good profit. In addition, this site is operating for more that a year already, I believe they are trusted.
In light of recent events, some might disagree with that statement.
My JD grows I think about 100% now back then up to today (I just checked my JD account just because I saw this thread as after I invest, Im only checking my account at least 1 to 2 times a month).
And how much of that came from actual gameplay only? Around 3% maybe? That's at least cutting the range.
You shouldn't forget that CLAM are a staking coin and you could make a decent profit (in terms of clams, maybe not in terms of btc equivalent) by staking them yourself/in a pool without any gambling aspect behind it.