Pretty solid deck, doing that simic thang, gonna be a real house if your opponents don't have answers. A 6 mana commander that requires a follow up spell for any benefit may be tough to pull off, but we don't run enough removal in our meta so I think you be fine with the protection you have. Also the 99 of this deck is good enough to never cast the commander.
I would cut
Champion of Wits, its a cantrip and not card advantage, the 7 mana ability is pretty much irrelevant at that cost. Something like an
Elemental Bond and
Garruk's Uprising (also good to have 2nd Trample enabler) will give you way more value in a creature deck.
I would cut
Shamanic Revelation and repalce with
Return of the Wildspeaker, the instance speed and ability to pump make this perfect for this deck. I would replace
Curious Herd with
Pest Infestation, which seems like dope card I can't wait to try. In my experience with
Mist-Syndicate Naga, you cant really rely on it for more that one token, so a
Cackling Counterpart seems better.
Myr Battlesphere seems perfect for this deck. Last but not least, if you can find a spot for
Nacatl War-Pride, put that shit in. It's an absolute BOMB if it swings in and my favorite win con in Volrath.
Biovisionary - lul - nice.