I think that the Path of the Mage should look like this to make it more interesting:
Compassion > Summon Wisp > Summon Lightbringer
Aeromancy > Summon Air Elemental > Thunder Rites* Geomancy > Summon Earth Elemental > Stone Rites*
Hydromancy > Summon Ice Elemental > Frost Rites* Pyromancy > Summon Fire Elemental > Volcanic Rites*
Summon I**> Summon Ignys > Summon II**> Summon Craig Spawn > Improved Summoning*** > Summon Grave Elemental > Summon Mastery
Prodigy I**** > Evoker I***** > Knowledge****** > Savant > Affinity > Prodigy II**** > Evoker II*****
* + 25 % damage with (element) spells, Tireless March (Air), Cloak of Thorns (Earth), Protection from Cold (Water), Protection from Fire (Fire)
** + 2 level / + 2 level
*** The hero can control two summoned creatures
**** + 15 Spell Mastery / + 15 Spell Mastery
***** + 25 % damage / + 25 % damage
****** + 1 mana per turn