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Don't take Medusas – that's complete nonsense. Minotaurs are slow and vulnerable to magic; Medusas shoot, and if you gather, say, 100 of them and cast Cat's Reflexes, they can eliminate 1 to 20 level 4 creatures in a single turn, regardless of distance. Medusas are one of the most terrifying weapons of chaos.
Where can you think things through?
Well, let's say, Death has ambiguous choices at all stages.
With Might, level 4 depends on what you want, because the Beast is an exclusively defensive creature, while Thunderbirds are offensive.
At level 2, it's better to take Harpies because they are versatile.