This looks like a really cool deck! I don't think I have any ideas for improvement at the moment. Maybe Phyrexian Processor or a little life gain simply because it's gonna take you a little longer to get that near Death Experience out. Maybe even Phyrexian Unlife to give you a wee bit of a buffer. But other than that I can't wait to see your opponents face when they realize you're not dumb and that you're hurting yourself for a reason :P Also, I have a few of the cards in here like Dark Tutelage and whatnot :)
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Awesome looking! I think Auratog is a great addition because it gives you more creatures to enchant with along with something else to do with your enchantment. Wheel of Sun and Moon I think is a good addition as well to prevent you from milling yourself between Auratog and Zur. :D
Brutal deck. Definitely keeps your opponent guessing :)