Mine is probably that I chose Life as my primary school. I can't cause any considerable damage until an average of 4-6 turns have passed (enough time for me to Life Blade, Spirit Blade, Life Trap, and Amplify [from gear].) I would much rather start over as Ice or Fire, with Life as my secondary.
Mason LotusPetal Magus Theurgist
Ice is weaker than Life. (Well, not the rank nine spell, but Life gets more damage boost).