I feel like there are a lot of amazing green AND blue creatures you are missing, the sorts that really fuel a deck like this. Where is the Liege and the Overbeing especially? Your deck will still be fun to play, and it's your deck, but I feel like the fun of Momir is getting both to proc at the same time. Also, maybe I wasn't looking hard enough, but I don't see anything that benefits from the artifact lands. They are expensive (real money wise) and easier to kill than usual lands, so I'm not sure why you included them. Overall, a cool deck though.

@theauthentic: Murkfiend Liege is something I did consider, but I felt Seedborn Muse is more useful as she untaps all my permanents. I forgot about the Overbeing of Myth , though. Any ideas on what to replace for her?

On a side note, could you list any other cards I really should include? This deck is a WIP, and I'm open to suggestions, since simic isn't a color combo I've done before.

The artifact lands can be fetched using Tezzeret, and can be untapped by him, although they may be replaced if they become a liability.

Shardless Agent is gold. It seems like you dont have much creature control does that give you problems? What are you usually using as win conditions?

@cooknathan: My major win con is Avenger of Zendikar + Craterhoof Behemoth. I did consider Laboratory Maniac in case I end up drawing my deck out. Have any other ideas for win cons?

This is just the first draft of the deck. I'll get testing it soon to check if creatures are a problem and go from there.

Well there are any number of possible win cons you could include, but we would be here all day ;-) avenger + behemoth looks pretty cool if you can dump the mana accelerators out quickly enough. A few from my personal experience with Momir is sharing your opponents creatures Beguiler of Wills or direct damage Molten-Tail Masticore these both also work as creature removal... The usual win cons in momir decks is board control/ramp into an aggro strategy (as is here) or infinite combo's. So I think you probably have enough big hitters but perhaps need more board control &/or ramp.

I find the bigger problem with momir is keeping your own creatures alive (from board wipes, doj etc), so on that note I see you only have 1 creature counterspell I would suggest adding Glen Elendra Archmage (and I would suggest other things depending on your meta).

Another quick thought is that you could probably replace some of your non-creature spells with creatures that do similar things. Some examples are Teferi, Mage of Zhalfir > card:Yeva, Nature's Herald > Leyline of Anticipation , Temporal Adept Viridian Zealot Brutalizer Exarch Woodfall Primus Sylvok Replica > Beast Within Capsize Krosan Grip Pongify , Krosan Tusker Frontier Guide > Cultivate , Primordial Sage Soul of the Harvest > Rhystic Study Rites of Flourishing , Elvish Piper > Tooth and Nail ...