Even with the moxen, I really think you shouldadd some lands. You don't always get draw Gemhide Sliver, and without it you have very little mana.
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You would think more people would have heard of the Highlander format by now. I see so many EDH and Highlander decks with comments suggesting going to 60 cards. Your deck is good. I would add a Patriarch's Bidding in case of Wrath of God.