To beat the hardest trials (They united, They returned, Protected Area):
The trick with this deck is to get your waking stones out with resonant helms and crowns of strength asap. This should completely lock down a row and you simply need to use kabonk and your other cheep spells to heal them up. Use imperial resources to get ahead and the position your high cost order units behing the barracade and then it isn't too hard.
I used this to beat the three trials within three attempts. You can see pretty early on whether you're going to be able to pull it off, once you get the barracade up it shouldn't be a problem.
Best of luck