Blood artist/Falkenrath Noble could cause some massive life draining over the game. Especially with your sacrificing abilities etc. :p
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Mask of Avacyn would be good for a sideboard choice I think. If your opponent has a lot of removal then giving hexproof to the high costing would be invaluable. Also possibly sheltering word or other hexproof but I haven't been playing long so whatever you think best. :p