It seems that Imps are now banned in castles. So, maybe all level 4 combat units should be banned as well? Or perhaps the 4th-level spell might be useful somewhere?

But then, how do we deal with enemy Azure Dragons? They gather in groups of 15, while we only have a few, plus some other minor units. It's okay if we're playing as Haven, theoretically we can take them out with Titans from under the power field. But what about the other factions? There's no resurrection available in the early stages of the game (only from Archons). Even if we try to wear them down through castle sieges, we'll still take significant damage from the ranged towers.