You have a decent amount of ramp in here so you could probably get away with running 23-24 land. I also think you would benefit from some late-game card draw to keep your hand full and dropping more cyclonic rifts. Prime Speaker Zegana or Opportunity would fill that role nicely. Regardless, I like the deck and you have my +1.

The only problem with shaving lands is that the deck can be prone to awkward mana situations, especially mana screw. I agree with the need for additional card draw, so I could see going to 24 and then adding maybe a singleton Prime Speaker Zegana . I'd be afraid to go to 23 though. Thanks for your input!

Another card I forgot about is Urban Evolution . Weaker card draw, but more ramp.

Looking good. You might consider cutting 1 or 2 Prophet of Kruphix . Don't get me wrong, prophet is an amazing card, but having more than one in play doesn't do you any good. Also, running 4 Simic Charm might be a little excessive since you are already running 4 Cyclonic Rift . The hexproof can be nice but it won't protect you from Supreme Verdict . I would definitely try to fit at least one Prime Speaker Zegana in there as well ... Anyway, this looks pretty awesome. Happy rifting! ;)

I can agree with that. The main reason I have 4 Prophet of Kruphix is that I noticed how the deck just runs sooo much better with an active Prophet that I wanted to make sure I was able to draw one in every game. I could see scaling back down to my original # of 3 Prophet's. I think Simic Charm is amazing and a card that definitely belongs in the deck. 4 copies may or may not be a lot, but it has so many useful modes that I couldn't see not running it at all. I think I might shave a Hydra Broodmaster for 1 Prime Speaker Zegana but Broodmaster is definitely insane. Generally speaking, the card closes out the game the turn after it's cast, especially if I have a Cyclonic Rift in hand or a Nykthos, Shrine to Nyx in play. I think I may also try Nylea, God of the Hunt . Thanks for your suggestions!