I tryed making this and the main issue it ran into was controlling the other players field. I tryed splashing red for control, http://www.mtgvault.com/ViewDeck.aspx?DeckID=88967 if you wanna check it out, see if any ideas jump at you. I really like the sacrifice idea and basis for decks.
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Sideboard War Priest of Thune or Solemn Offering if you wanna stay on the lifegain track, otherwise the red layline will ruin you.