Help with nature or Tien Chi/Jotunheim water magic

[Molog]

I'm interrested in what to do with nature magic myself.

The nature sleep cloud spell has the disadvantage that it only works the next turn. Your mages cast it on enemy troops and the enemy troops run away from it towards your troops before the sleep cloud does anything.

Protection is a good spell, because it adds to the armor the unit is wearing.
Eagle eyes gives extra precision, always usefull.
Eagle eyes + tangle vines is nice in incapacitating enemy troops.

Has anyone ever tried the alteration 9 polymorph spell. It has an aoe of 10+, magic resistance negates to turn enemy troops into pigs.