User blog comment:BlackWizardZeref/Chapter 369: The Place Prayers Reach/@comment-3075024-20140131175528/@comment-24066070-20140202210457

I just used Gray as an example since he was the first (and shortest) name that came to mind.

But, still the comet is interesting when u think about it. He may just create his own comet rather than actually pulling one from outer space (he's too weak for that) Ice Make: Comet may just be his trump card. Or Silver may be able to pull/create one.