First turn negator? Ahahahaha! Win!
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You should run laboratory maniac in the sideboard so you can self mill when vs eldrazi and graveyard decks.
This is by far probably the best land killer deck I have seen in awhile. It seems like you actually thought things through and planned the deck out with a real strategy, rather than just throwing in a bunch of crap land destruct cards. Seeing how you are already running power nine and sinkhole, you should keep up the old school theme and ditch winters grasp for ice storm. $$$!