I mean, that's just madness. There aren't any ghosts in the desert, and if they're going to do that, why not make like, a pharoah's tomb style level with a mummified pokies and a pharaoh boo called bootankhamun and now I'm rambling about shit that won't happen.
http://www.mariowiki.com/Mummipokey
Though I do agree. Paper Mario had a great pharaoh's tomb level. Wish the platformer Marios would start taking level aesthetic ideas from there