So, how would you represent a being who has Sponsored Magic-style effects, but no sponsor? The example I'm thinking of would be a Nephilim, a creature of angelic bloodline (and thus, nature) but no direct angelic sponsorship, but I an imagine others.
My inclination is to charge for Sponsored Magic as normal, but remove debt and super-charging mechanics, as well as agenda limitations--essentially, instead of taking pseduo-Channeling, and pseduo-Ritual, the character actually takes Channeling and Ritual with the "element" of the Sponsored Magic type. Of course, in our Soulfire example, I'd still tack on a bonus refresh in cost.
Thoughts?