Collar on Bloodghast isn't that good, as it can't block and nobody will put a guy in the way unless they're on like 4 life, when they've lost anyway. I'd main the Doomblades and side the Vapors, and I'd rather have more Marsh Casualties on hand.
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I seriously question those who would play Fog etc. He still has Emrakul and he still makes you sac six cards. I saw another deck like this that used Coat of Arms and pure Eldrazi spawn makers. It was really funny. I don't see how Mitotic Slime or Pelakka Wurm do much here. And you're as well just using 4 Emrakul ( or 4 Kozilek because he's cheaper to cast). And what is this, magical Christmas land? Put those snow lands away! :P