I like this deck. It reminds me of mine: http://www.mtgvault.com/ViewDeck.aspx?DeckID=130195 I use Teferi's Puzzlebox to make opps draw tons of cards.
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I would go with Primal Rage instead of Roughshod Mentor. You may also consider Shielding Plax for your Avatar of Might.
also, you might want to check out Razorfin Hunter. It only costs UR to cast. That and Sigil of Sleep is really nasty in this type of deck.
You cant have a sacrifice deck without Diabolic Edict.... or Grave Pact for that matter. Check this out: http://www.wizards.com/Magic/Magazine/Article.aspx?x=mtgcom/arcana/1119
I might take out Chatter of the Squirrel and put in the Hermit.
Never thought of that. Good idea.