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I recommend you take a look at my deck for inspiration: http://www.mtgvault.com/ViewDeck.aspx?DeckID=270773 I tried MANY different versions of this deck before finalizing it on this one, a few of them closely resembling your own. Though after 10 years of upgrading/modifying my deck, this is the most efficient it's ever been and you could pull quite a few ideas from it.
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To be more specific though, the biggest changes I would strongly recommend taking out 2x Nemesis of Reason and 2x Traumatize, replacing them with 4x Archive Trap. The reasons for this are two-fold. First, in regards to Nemesis of Reason, you pay a relatively high cost to play a vulnerable creature who won't have any impact until the next turn, IF he survives. As for Traumatize, if you're playing your deck right, there is no way your opponent should have much more than 30-40 cards in his library by the time you can cast Traumatize. So on average it'll mill your opponent by 15-20 cards, not much more than the 13 from Archive Trap. The advantage of Archive Trap over those two cards is you get immediate results AND you can cast it for 0, which is pretty easy considering all the fetch-lands being used. Next, I would take out the 4x Nihil Spellbomb and add 4x Surgical Extraction (or Extirpate) instead. You are going to fill up your opponent's graveyard with cards very quickly, so why not take advantage of that fact and use Surgical Extraction to COMPLETELY remove an opponent's threat from his deck? And with Tome Scour you can do that as early as first turn! Lastly, as much as I LOVE Creeping Tar-pit (by far my favorite man-land), it serves no real purpose in your deck, considering how you're going for the mill and not the kill. The fact that it comes into play taped will play against you more often than not. (Btw, I'd also try and find a way to squeeze in 4x Remand in there instead of Dissipate) Hope it helps! :)