Comics › X-Factor #19 Image 1 of 1 X-Factor #19 $9.99 X-Factor battles Pestilence, Famine and War, three of the Horsemen of Apocalypse. Written by Louise Simonson with art by Walt Simonson. Add To Cart Added! X-Factor battles Pestilence, Famine and War, three of the Horsemen of Apocalypse. Written by Louise Simonson with art by Walt Simonson.