Earthquake and Tornado sound pretty awesome, actually.
Though I would love to see, for the healer class, a way to heal your allies as you deal damage. As for the spells themselves? I'm thinking different colored flora for each kind of healing spell made. When the healer needs to do damage, I'm thinking it'd be a damage-over-time effect using poisonous mushrooms and nightshade. Maybe with their main attacks utilizing the sun and moon burning down on them.