If you're going to use magicka, why not just fire a ranged spell?
Fire ranged spells, not only being slow, run the high risk of hitting something you dont want it to. Like an ally helping you.
Frost Spells are the same as fire spells.
Lightning spells may be instant, but even then it is sort of inaccurate.
This is more of an adaptation for like a Battle Mage, in the sense that we would still have the mage, just replace battle with ranger. Ranger-Mage