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They cost a pinch more than Swiftfoot Boots, but you may like Lightning Greaves. I would take out Culling the Weak for more Dark Rituals; yes Culling the Weak goes with It That Betrays, but once that creature is out, you don't need mana boosters. Lastly, my favorite thing about It That Betrays vs some of the other Eldrazi is that it doesn't shuffle back into your library from your graveyard - you can bring it back. Imagine turn 2: second Swamp, Dark Ritual, Smallpox, Exhume for It That Betrays. And the best part about Smallpox and Exhume (for your deck) is that they have good utility outside of that combo. Great work so far!
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All of those were great suggestions. Thank you. I made all of the changes :P I'm up for any advice. I was just in class and randomly thought "hmm... That would be cool for a deck" so it was sketchy at best.
A first draft should never be a final draft. Think on it, maybe play it some, and then do some more adjustments - that's half the fun of Magic, in my opinion.
If you need sacrificible creatures, maybe Butcher Ghoul? Or, in the case you are not afraid of high values, Geralf's Messenger.And, you really should remove Necrotic Plagues... I think you don't like when they dump them on your It that Betrayses or Crypt Ghasts.If you need more mana ramping, then I would suggest Bubbling Muck.
I like those ideas, but I am going to keep necrotic plague. It's a constant was to get my opponent to sacrifice. I don't care if my creatures go either because I will just get theirs. Lightning greaves to protect the big stuff. Bubbling muck is awesome because now it is theoretically possible to summon It That Betrays on turn 3. Most likely not going to happen, but possible none-the-less.
Smart thinking.