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This deck is usually pretty reliable. Can hold down a table of 3-4 players pretty easily. Weaknesses might be lack of good removal in the colors. I've played too many games with it too pick out specific match ups. Basically played everything. It wins upwards of 70-75%. I'm working on getting the mana curve down but don't want to compromise card value.
Temporal Mastery is more of a cute trick than anything. I used to run Time Warp as a way to go infinite with witness/shard but, it was difficult. I've really been considering Edric but, I'm not a huge fan of helping opponents.Liege is lackluster unfortunately. Used to have cold-eyed but she never quite worked as well as I wanted her to. Thanks for the suggestions.
My style is a little different to yours, I focus much more on creature utility and combo's so apologies if my suggestions are a little biased. I think you could perhaps replace some of your non-creature cards with creatures that do the same job except you can tutor them with Momir. So I would suggest; Kederekt Leviathan > Evacuation
I can offer a few suggestions in removal as I have struggled through the same problem lol. For creature removal things like Molten-Tail Masticore , Triskelavus , etc. Things that take creatures, Beguiler of Wills , etc etc. Bounce mechanics, Temporal Adept , Void Stalker , Brutalizer Exarch , Equilibrium . Other (trickier) control mechanics, Pestermite , Spike Weaver , Winged Coatl , card:Pemmin's Aura. Board wipes, Oblivion Stone , card:Nevinyrral's Disk, Kederekt Leviathan ...
Id strongly suggest Drift of Phantasms to search for some of your non-creature cards (many of them are 3cmc to start with), I would also suggest things like Shrieking Drake for draw, Lighthouse Chronologist if your keen on extra turns, Aluren if your competitive.
Well I hope that gives you some things to consider, Momir, King Kombo thats my list. +1 from me, although it isnt my style.
First of all, UG is my favorite color combo, so already a fan. It appears that you have a lot of counter-magic, which except for Voidslime isn't totally necessary. card:Nature's Claim is a pretty strict upgrade from Krosan Grip . Overbeing of Myth is a good source of card advantage, produces board presence and triggers your general. Murkfiend Liege and Fable of Wolf and Owl are a pretty fantastic combo as well. Beast Within , Woodfall Primus and Ulamog all provide good removal. Skyshroud Forest is a second Yavimaya Coast . You also have a seemingly random amount of artifact destruction/countercreatures/mana dorks and not very many win conditions, so might I suggest Avenger of Zendikar .