Wishing for souless seems like a pretty useless summon.
I've found a lot of summons to be substandard to the point of uselessness. The list includes:
- Spirits of the Wood: Hama dryads are weak, immobile, fragile, and expensive. The worst of all possible worlds.
- Corpse Man Construction: 1 souless isn't enough of a return to justify spending a mage's turn, let alone any gems.