The first i see here is that you don't have anything to deal with the board, so you'll more than probably die to anything that hits the board, even a simple 3/1 two-drop
During your turn, as long as you've sacrificed a nontoken permanent this turn, you may play cards exiled with this creature
In fact, this main set Sauron is so good that if you're looking for a power boost then I would put it in the command zone and put Sauron, Lord of the Rings in the 99, they provide similar value to the deck but Sauron, the Dark Lord is simply stronger
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I dont think this is really going to fly but combining this with Oblivion Ring, Leonin Relic-Warder, and related effects leads to a four card combo that will mill the opponent out on the spot using only cards that have decent utility all by themselves (other than the Altar, of course)
When Vampire Spawn enters, each opponent loses 2 life and you gain 2 life
