Today, Kanye West delivers the video for "Mercy," the excellent Big Sean/Pusha T/2 Chainz posse cut that he released back in April. Directed by Nabil, the video is a stark and elemental black-and-white thing: The four rappers (plus one woman, a couple of expensive videos, and a dancing Kid Cudi) in a gigantic unfurnished room, seen in one continuous take ...