Very reasonable Idea Ethica. It could even be directly related to mind points so if the Wizard lost a mind point he would loose some mana points as well. Wizard could start wil 24 (Mind x 4) and Elf could start with 8 (Mind x 2) The base spells would cost someting like this
AIR
Swift Wind = 1
Tempest = 2
Genie = 3
FIRE
Wrath of Flame = 1
Ball of Fire = 2
Courage = 3
EARTH
Pass Through Rock = 1
Rock Skin = 2
Heal Body = 3
WATER
Sleep = 1
Viel of Mist = 2
Water of Life = 3
CHAOS
Ball of Flame = 2
Cloud of Chaos = 4
Command = 3
Escape = 1
Fear = 2
Firestorm = 3
Lightning Bolt = 3
Rust = 1
Sleep = 1
Summon Orcs and Summon Undead = Viariable costs as follows (might even take out the die rolling)
2 for lowest number summoned
3 for middle number summoned
4 for highest number summoned
Tempest = 2
The bad guy casters would have anyware from 1 x Mind Points (Fimir Mages) to 5 x Mind Points (Witch Lord) mana points. Spell ring would change to +3 mana points.
Do you like? (Idea comes from the above post)
I realy want to try this out. Anyone running a game in Michigan any time soon?

-SadKitchen