[Zapmeister]

Anything is not as common as your national troops since you can build them in any castle, so obviously you can't judje indep. province frequency by such criteria.

Yes you can. We're trying to determine the availability of clam forgers. Atlantis and R'lyeh have national units that can forge water-2 clams. No-one has national troops that can forge water-1, nature-1 clams without a lucky random pick. That's the point.

The solution that could fix overpowered clams problem without raising its cost - like seting max limit on number of clams per player,

But I'm not suggesting that. I'm saying that making them water-1,nature-1 is enough because of the reduced availability of forgers and the usefulness of nature gems for other purposes.

I'm also saying that anything more than that is overkill, and will never be accepted by the folks that don't even agree that clams are out of balance in the first place.