...is vastly under-rated.
I have a new Zhao build that ends up murdering just about anything. At least it has the last couple games I used him.
Sword of the Divine
Wit's End (Optional; might rush to Bloodrazor instead if there are several non-Mana champs)
Last Whisper (If Wit's End isn't an optimal option)
In short, mass attack speed procs Divine's +100 Magic Damage passive a LOT, which builds up fast. Wit's End does a constant 40-ish Damage while draining the mana of the majority of champs.
Bloodrazor adds even more AtS and throws in a very powerful passive. Rest is survivability.
I'm using a crit runepage, which ends up being more effective than I thought; gives me the early game burst until I get all the items. 19% with Runes and Masteries.
I'm hoping to get people to use the Sword more often. =(