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I use a build pretty similar to yours.
Try 2x Staff of Domination if you don't like the Curio. You need another way to combo/win.
Craterhoof it's better than Emrakul, it's tutorable and 8 mana it's more viable to acquire than 15. 2x Regal Force it's enough.
I don't like the Imperious Perfect . I would prefer +2x Scrybs instead.