Give summons much longer cooldowns so that even with high int, it takes 5 or 6 turns to summon one again.
Especially all summons should share the same cooldown. My mage was "focused" on mage-talents only, what ends in witchcraft, fire and earth high enough to spell summons. Even with 6 rounds cooldown this mage would be able to cast a summon per round (3 witchcrafts, 3 earth summons, 1 fire summon, 1 pet summon)
At least the cooldown should be shared within the discipline ...
