Regarding my Zodiac sign (Aquarius (Primary; Fixed-Air sign), Ox/Rat (Whichever one is most accurate with '85)), I excel at water, wind, and cold spells, and can also increase yield in looting by chance, and I can also allow myself added strength abilities.
My learned spells would involve time/space magic, which I at least dabble in which allows me to manipulate trajectories and velocities as well as encapsulate things within my awareness in pocket-dimensions where certain laws follow differently (time dialation fields and such). Be wary of any portal-based dick moves; especially if I have posession of a laser cannon or something; provided I get my trajectories correct (sorta reminds me of something I would do with an airship design I made that used such a cannon, and a space/time manipulator).
In a similar vein to Fullmetal Alchemist, I would alternatively develop magic techniques by learning the mathematics behind them (especially in order to operate time/space magicks to their maximum potential). Theoretically, if magick is a form of spiritual power, then it's mathematical equivalent can bypass the spiritual boundaries, and not be able to be absorbed at a spiritual level like most other magicks (dark/light being prime examples). Sure, someone throwing a ball of fire from their spirit won't burn you if you're apt to it or have a protection rune, but what if I were to set something on fire, and then throw it at you? Try to absorb that now. (Example: Fire magic in Final Fantasy games vs. my example, or hitting them with a fire arrow or something)
I would imagine, for example, using a bunch of compressed air in a column to carry a mound of sand, vibrate the sand at extreme speeds to heat the sand into a molten glass, and then utilize a bit more compressed air pockets (primarily as a series of hot/cold spaces to toss it. It would be a bit of math to go through, but at least you won't have to devote your soul to anything (*cough*devil*cough*) to get the job done, in some cases. Of course, there's always a simple workaround with, I dunno, guns, sniper rifles, shotguns, and maybe casting haste on them bullets to give them even greater distance/muzzle velocity. You know what? Screw it, I'd prefer augmenting technology with magic. Imagine, if you will, a shotgun that fires shells with the pellets within, each, turning into icicles... on fire, and with electricity flowing inside the ice.