Modified wizards constitution for his age with an appropriate High Concept, if the power is from a greater force AND has control over him then emissary of power works if not then your fine you can just be a guy who karma decided to punch in the stomach. From there I might consider some levels of speed, toughness, strength, recovery, etc and maybe a modified version of Unseeling Magic to fit with the fact your not under the thumb of any of the queens. with ten refresh it sounds totally doable.
Go for it.