[Wyatt Hebert]

I would also think you could use this to improve some of the less impressive summonable commanders.

Ivy Kings: Auto Mass Protection
Mound Fiends: Auto Protection of the Sepulcher (or simply AM)

I like the idea of 'human' heroes summoning up an honor guard. I would also like the following ideas for heroes with autobattlespells:

Caelian Archer Hero: Wind Guide
Caelian Storm General: Arrow Fend
Witch Hunter General (Marignon): Flaming Arrows
Orestes (Arco): Power of the Spheres? (Really nasty, I know)
Carmont (Marignon Cardinal): Either Cleansing Water or, to really hose the undead, Solar Brilliance.

The unique Amesha Spentae for Caelum would also be good candidates, imho. They aren't nationally summonable, and, while good, could use some autospellcasting.

A Pangaea or Man hero that casts Relief could be interesting.

Just a few thoughts.

Wyatt