We haven't played it for years, so I had to look it up.
Each magic-user gets a D6 of magic points plus level bonus (0, +1 or +2) to use each turn, and each can cast a spell in each phase of the turn. Spells vary by magic-point cost with extra cost for medium or long range. There are four basic spells: boost, attack (with two forms - shooting or morale, essentially), protect and rally/heal. So it's quite simple but also a bit different (multiple spells cast per turn, potentially). I can't remember if we ever used spellcasters when we played.
I must give the game another spin at some point; I recall that we really enjoyed it, but then I got back into HOTT, and with that and Kings of War, the rank-and-flank itch has been fairly thoroughly scratched.