I am thinking about respecing my mage. I am interested on peoples thoughts about this build.

4/5 - Fire - no scorch
4/5 Time - no time bomb
4/5 Frost - no shatter
3/5 Lightning - no discharge or shock

5/5 - Knowledge
5/5 - Agility
5/5 - Might
5/5 - Damage
5/5 - Critical

My current build uses heal. It helped when I was a noob and didn't have money for pots. Now it is a waste. I also thought about using shield but this build strikes me as the ultimate damage machine. I am interested in some constructive criticism.