User blog comment:Khaladar/Purgatory/@comment-4834593-20120610195702

Looks like a nice item. And together with 2 Phantom Dancers and an Infinity Edge exactly 100% crit chance. Even though you wouldn't have that much attack damage then (180, if your fifth item is a Bloodthirster).

At least attack speed would also be nice with those four items.

But on topic, does the passive stack, or refresh? I'd think the second.