Before having other options through multi-classing, I used mystic blaze mainly as a filler or pull spell. I still use it occasionally when fighting undead types. If it were boosted, I could see it getting more use.
If I remember correctly, I was running Aura of Light on a Valkor hunt, and a group member had a healer aura running (the one that cycles a % to health), which canceled out Aura of Light. I don't understand how these would be in conflict.