[shatner]

I agree that the net positive benefit for a Heat-preference nation is less than a temp-neutral, cold-3 nation. However, that cold-3 nation does need to deal with the gold loss of all of those turns leading up to them casting Second Sun PLUS all of those turns leading up to their reaching a neutral temperature.

I agree that taking cold-3 and then casting this is clever but you do have to account for all the time it'll take them to reach Evocation 6.