User blog comment:Water Dragon Slayer/DREAM BATTLE CHRONICLES: SECOND MATCH!/@comment-5598380-20130723085534

Dream Battle: If Mavis is still alive then she still have her full power. She would still be able to use Fairy Glitter for attack and Fairy Sphere for defense. There's no doubt she would win.

Back to reality, Zeref and Mavis can't see each other, and Mavis is already a ghost. So it's a mismatch.