Pointed Discussion

In a green/red deck with ways to untap land outside your untap step and Doubling Season, this could be good for the late game.

The problem with lands like this and their potential combinations with Doubling Season / Gilder Bairn or Proliferate is that you still have to spend mana to get mana. Usually, getting a net gain isn't worth it unless you have an cost worth paying.

But if you're patient, I suppose it wouldn't be bad.

And then they made the Mercadian Bazaar cycle of cards-- Saprazzan Cove, Subterranean Hangar, Fountain of Cho, etc.