Good job. I think you win the deck war this time in terms of balancing control into the mill. I would probably take out Opportunity though. Put Traumatize in its place or another Breaking//Entering. I really like how Tidebinder Mage goes well with Soul Ransom for creature-grindy games. Also, I really like Nightveil Specter in this deck at the three slot in place of a couple Hover Barrier. Hover Barrier is a great defense and disruption, but exile mill is WAY more threatening to Junk matchups, control decks, and especially, DREDGE.
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http://www.mtgvault.com/guydo/decks/standard-mill-rtrths/