It seems like a good idea.
One thing you could be able to do would be, oh I dunno, have a promoted unit (probably a cleric) able to beseech a god with a certain staff or etc. Said god would be summoned and do something based upon the staff you used. However, the god could fry your unit, taking away 50 percent of its current HP if they didn't have enough of a stat(s) they favored.
It could work, but that's just an idea.