just a little tip you cant have Deathrite Shaman in the deck because he has black in his mana symbol. I wish he could but thats against the EDH rules :|

I like your version here! One thing maybe to consider (because it has happened to me) is adding some flying protection. You have a couple big spells that provide flying, but have you ever considered Jagged-Scar Archers or Ice-Fang Coatl (which also gives you card draw). I run infect in my Ezuri deck so I also have a Inkmoth Nexus just because with all the counters and proliferate, infect just fits in real nice. Also, cards like Slippery Bogbonder and The Ozolith allow you to put more counters on Sage making his abilities attainable even earlier! Of course i will also suggest Eladamri, Lord of Leaves , though this suggestion would have been better a month ago before his price spiked to over $100!! I was lucky enough to pick him up at the $20 price point long ago, which makes him a must add in this deck at that price point. Overall nice deck!!!