Kanye West: Who's left for him to duel?

The first rule of hip-hop beef should be simple: Don't punch downward. That's why the Jay Z-MC Hammer "feud" of 2010 never took off; it's no fun to watch a heavyweight champion beat up someone not in his or her weight class.

This is a problem for Kanye West. Currently on his "Yeezus" tour with opening act Kendrick Lamar, West is one of a very few emcees who garners headlines and attention everywhere he goes. His moves are constantly debated, his home life is a source for tabloids and his rants are fodder for armchair psychologists everywhere.

But if West is nearly out of emcees to battle, what will he do with his aggression? His recent spat with Jimmy Kimmel was fun, but who else exists for him to battle?

amNewYork has some ideas: