The deck is strong but I'm not sure it's cEDH level. There are multiple cards I'm questioning simply as a cEDH strategy.
Harrow - Why not
Crop Rotation? I see that I'm blind....
Oracle of Mul Daya - 4 CMC is a lot for the effect it gives you. Especially since one of the effects is negative. You want to avoid giving your opponents information, especially in a format as fast and powerful as cEDH. I would personally love to see an Oracle as I get to see every draw now. I know when you have counters for my combos.
Back to Basics - you only have 10 basic lands in the whole deck, and if you're on this, you will probably be fetching basics instead of multi-color lands that help more. Not a game plan I would really want to be on, but I would consider testing it.
Sea Gate Restoration // Sea Gate, Reborn/
Turntimber Symbiosis // Turntimber, Serpentine Wood - MUCH too high of a CMC for the card effects. By the time you are playing something like this you should be winning the game. Sea Gates best case is you are drawing 8 (most likely). Now you just spent 7 mana to draw 8 cards. I would be willing to bet 9 times out of 10 you then have to discard 8 cards at your end step as most of your mana was spent to cast sea gate. These also being sorcery speed is another negative, you can't hold up mana to cast them before your turn.
Personally I would take all of these out. From there I would add in more counter's and interaction. I would even put Jeweled Lotus on the fence, it doesn't really enable a t1
Aesi, Tyrant of Gyre Strait, and the later into the game, it gets exponentially worse. I would also consider a
Summoner's Pact to find you
Azusa, Lost but Seeking. I might even push towards adding more mana dorks as well, dropping the artifact ramp some and adding artifact hate as others have suggested.