Which units would you replace in the Sylvan castle?

I would replace the Emerald Dragons because, compared to the Dragons of the East, they seem a bit weak, even though they fight very well. Maybe they should be changed visually; being completely green doesn't look very good:(:smile39:

Added 7 minutes later
Give them some kind of aura (for example), magical leaves of different colors around them; it would look impressive. Plus, instead of resistance to Earth magic, give them (Elven Retribution) – once per battle, a creature counterattacks successfully regardless of the hero's luck, and immunity to Wasting.