User blog comment:Jao and jom/Item Idea/@comment-5557556-20121001132810/@comment-5441738-20121001164021

Methinks you misunderstand me, anon. I don't think it needs any more than it already has, even before the unique active. Items don't need a unique passive to be incredible. Lich Bane, Hextech Gunblade, Nashor's tooth, Phantom Dancer, and Trinity Force are nothing but an improvement upon the sum of their parts yet are ridiculously good in the right hands.

As far as your suggestions go, no, I don't think either of those (especially the mana burn) are both useful and viable. If it needs a "unique" passive, then I would claim that the penetrations should go there. It may then need an extra 5 or 10 pen each, but that shouldn't be a big balance issue while still being beneficial.