[Gandalf Parker]

There are magic sites with a conjuration bonus. Can that be given to a unit? Just a thought. It would make a nice addition to a Master Summoner.

I find that the immortal switch (the phoenix looking icon) does much toward making me want to use my god. It feels thematicly logical. Use him to help protect his provinces, but dont let him stray beyond the strength of his domain. He must remain inside the light of his dominion where he is strongest and safest.

There are also pretenders who summon either each turn or in combat. Tying all of those together would make a really cool Master Summoner god.