Which units would you replace in the Sylvan castle?

By the way, yes! If elves are to have a dragon, it should be this one! And it would match Silvan! I could write a letter to Nival right now, asking them to replace the emerald dragons with magical ones! :)

Or, you could completely remove the beekeeping from the dryads or reduce the number of druids and introduce a fairytale dragon, probably the cutest creature among all the units in the last three parts. Give it a random attacking spell, extremely low defense, and damage like a bone dragon. An upgraded dragon could also cast mass spells on its own, but only for a short time, so as not to disrupt the balance.