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Well, personally, I found that A Nunu with a Yi can do incredible amounts of damage very early on.
My favorite combo is Nunu's ice ball, followed by a Ghosted Yi, (Preferably with ghost) who uses Wuju style.
One done correctly can almost always get off a kill, sometimes even a double for an empty lane.
(Once Yi starts the chase for his target, Nunu targets the remaining champ)