Sadly, Germanico is right - currently there are no games where you CAN'T use gold. BUT, when I said that there are some games with "no gold" rule, I meant: 1) Tournament, which actually has strict "no gold" rule controlled by CoN staff (not sure why Germanico didn't mention it, probably because it is held once a month); 2) Alliance challenges, where players AGREE to not use gold. And violations aren't common, actually.
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Sadly, Germanico is right - currently there are no games where you CAN'T use gold. BUT, when I said that there are some games with "no gold" rule, I meant: 1) Tournament, which actually has strict "no gold" rule controlled by CoN staff (not sure why Germanico didn't mention it, probably because it is held once a month); 2) Alliance challenges, where players AGREE to not use gold. And violations aren't common, actually.