I read the baalz part on the first page... Baalz, Baalz, Baalz... What were you thinking. I couldn't even finish reading your guide. They use hydras and should take heat scales at least a little unless they are absolutely maxing out gold (which, of course, can be quite useful).
Not that I've ever had a problem with hydras passing out, but, on the other hand, I always take the easily justifiable 40 points!
Unless you're 2player vs. Abysia (or similar matchup) I wouldn't take cold. Hydras should come in behind other stuff... the stuff will die, of course, but will keep teh hyrdas alive longer. Just a little Hydra guide... You can even have them retreat then (via commander retreat).