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Well... To not notice the power of the Harpies, which everyone is already trying to eliminate because of their proximity to the Chitu, that takes skill... No offense, Julyanna, take a look at this replay I'm posting and tell me – how would the Assassins get out of this situation? Or at least how many casts could they withstand before dying a shameful death? The situation was difficult – I simply didn't notice that the Druids were an "horde." And the result of this battle was 46 Harpies against 69 Druids – 4 Harpies survived. And the Assassins wouldn't have stood a chance there.
Now, about the Mistresses. Take a simple dueling Lethos and see what they do. The melee unit among them is deadly. I don't usually play duels, and I'm not a very good duelist, but my Mistresses stomped an entire Demon army for several turns – but couldn't quite finish the job. And 2 units in invisibility are an unnecessary number of casts that the Warlock desperately needs.
As for the Dragons – it's simple here. Since I play as Lethos, and very often (maybe I'm just lucky?) have a full Dark magic school in my spellbook, Red Dragons with Vampirism are my choice. Unfortunately, I don't have a replay of how I took out 47 Black Dragons with 17 Red Dragons without any losses...