This is a clever use of collage technique to reflect two main characters of the movie, a protagonist&an antagonist, the cards is the representation of the Joker in The Dark Knight form, Don’t you agree?
anyway I found this interesting poster at graphic-exchange.
Ok, let’s be more critical about it, I think this poster could/should cut the typo part off (I mean “THE DARK KNIGHT” white overlaid letters) because the illustration itself is strong enough. lettering part is kind of out of the place or just it’s still not right.