Karthus, Brand and DFT

Brand's passive damage was recently buffed in order to compensate for his dropped winrate as a result of deathfire touch being removed. To state the obvious, he and some other mages didn't have as fitting a keystone mastery. Karthus had arguably the same issue, dropping 2-3% in winrate after the new rune page patch despite no other changes. Aery and Comet synergize with the Karthus kit to an extent, but neither really makes full use of his ult as he can only apply it to one target. Thoughts?
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