Take a look at my White Squad in the order of board placement:

1. Silvershield Paladin (5 mana) - First line tank. He takes reduced damage from physical attacks and reflects some of magic hitting him.
2. Silvershield Knight (6 mana) - Offtank and main horsepower of the team. Tramples over killed foes hitting enemies twice! The horse is really fast and almost always hits first in the round. Boosts physical attack of allies also.
3. Feral Spirit (3 mana) - Sneaky guy. Silently backdoors enemy army.
4. Divine Healer (3 mana) - Old man support. He knows some of magic, dealing nonphysical damage and healing allies each round. The slow ability can turn the tides if dealing with serious opponent.
5. Tyrus Paladium (3 mana) - Leader enlightened by Khymia. He gives +1 armor to all of the squad.