[Kromm]

Magery is the Talent for using magical powers, including spells. All magical powers have a -10% limitation for being mana-sensitive, and spells implicitly have the same drawbacks. Ergo, it makes little sense to give Magery the Cosmic advantage. Instead, just take a Cosmic power -- with a +50% power modifier -- and use the usual 5 point/level Talent for that. If you also have a body of skills that benefit from that Talent, kick its cost up to 10 points/level, but don't call it Magery. And note that no matter what the Talent costs, the skills probably need some funky prerequisite to make them fair, since they're no longer mana-sensitive . . .