Summoned monster buffing

[ddgon]

What level would a spell that gives summoned monsters (yours or even just allies and not summons) like +1d6(fire/cold/acid)??

Or would it be more of a feat to empower summons? thinking wizard summons.

[Goth Guru]

I'm going to look over the summoning lists before I respond.
It sounds like the difference between a young and a young adult dragon.