It’s Blaz the impaler. A banner unfurled over the Staten Island Expressway Tuesday shows New York City Mayor Bill de Blasio smirking in a Che Guevara shirt — while holding up Lady Liberty’s severed, bloody head. “It’s what he’s doing to New York, he’s severing the head of the greatest city on earth,” said the artist behind the eye-grabbing work, Scott LoBaido. The Staten Islander was spurred to take a stab at Hizzoner over his response to the Black Lives Matter protests raging in the Big Apple. “New York has turned into a sh–hole because of this guy,” LoBaido said...