User blog comment:Drakan95/L vs Sherlock Holmes. Epic Rap Battles: Cartoons vs History. Season 2/@comment-24322797-20151110135854

So putting two-and-two together, with the graffiti hint, and Bambi saying "the clone of a Griffin vs someone who's been in so many battles before" I think it's safe to say Bart vs Banksy is next :P