Clock of Omens is a good card, but I personally feel like Voltaic Key would serve you better. Have you looked into that?
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This is a very strong and cost efficient deck. However, I think removing Terramorphic Expanse in favor of some more Plains or some mana acceleration might be more worth your while (Terramorphic Expanse counts towards your 1 land per turn). If you can survive past early game, you've got it made.
Given the idea of this deck, I'd say it's very good. The whole idea of a life-gain deck is to last long enough for you're big combo to work, and then take out your opponent in one fell swoop. You're mana curve seems very appropriate, but I think you may have slightly too much land. Do you ever have problems with mana flood?
This deck is obscenely powerful, but unfortunately I think it could be very mana starved. Things like Rampant Growth are fantastic, however, you are very much in danger of having all 4 of them in your hand, and everything but Green mana sources available. It seems like a fun deck, but I think it's trying far too hard to do too many different things.
This is a very strong deck in my opinion. The biggest weakness I can see is that it is so creature based, so it is especially susceptible to Walls with reach and creature removal spells. But man, those creatures will hit very hard if you get just a few into play. Consider splashing in a card such as Shared Animosity, which could make an already damaging deck that much more devastating.
Really good deck I think. I am a bit concerned about how many Myr Enforcers you have, but I do realize that the more of them you play, the cheaper the rest get. Have you thought about putting some equipment in there? Maybe remove some of the more situational spells (i.e. Sanctimony) and add some more artifacts. But, that's just my personal take on it. Your deck looks like a lot of fun to play!