Don't mulligan, don't play a land t1. if you didnt' go first, at the end of the turn you'll have to discard a card. Discard
Shadowborn Apostle. Now he's in your gy. I love the concept, the only scary part is you're putting alot of faith into the top 4 cards. Instead of the fetch lands, I'd maybe throw in Temple of Deciet, which will help you get that little bit of edge in filtering the top 4 cards. Maybe even a couple
Halimar Depths. after you
extirpate, you have at worse 17 cards left in your library. Although it's statistically unlikely that one of the top 4 won't be Emrakul, there's always a chance.
It feels like if you don't have
Extirpate/surgical AND shadowborn in your opening, non-muligan hand, you might be in for a bad time. But, actually, I like the deck. Definitely original.