Damage output mage: Level 16
5 Fire
5 Light
3 Gale
1 Heal
1 Arcane Shield

Why low heal?
You're trying to get the most damage done to ALL the enemies around you. AoE damage is the mage's specialty.
Support mage: Level 16
5 Heal
5 Arcane Shield
3 Curse
1 Light
1 Fire