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Guys, before making such changes, equalizing unit tiers and alternate units, you need to make sure that the overall faction balance doesn't get worse.
Sylvan: Elven Archers are already not the strongest faction, and you want to nerf what they rely on (along with Ents). Don't do that. If you equalize unit tiers, then rather buff the Masters, or, if you even want to nerf, then buff Unicorns or someone else.
Necropolis: You can buff higher Vampires, and it's also reasonable to nerf Princes. Reduce the cost of Necrodrakes? What is the goal of this change? Does Necropolis have a shortage of units?
I agree with the changes for Lizards, Bone Golems, and other minor units.