could try a sanguine bond or a wound reflection? would be an interesting alt win, since with wound reflection opponent(s) would take 6 damage a turn. plus with exanguinate you could double your damage. you would only need one or 2 maybe (incase of counters)
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nice deck, only problem is emrakul is banned in edh format, (plus if you drop him you will be dead before you can say elder dragon highlander
leyline of the void would work really well too,
just an idea, but you could use something like aether adept to bounce snapcaster back to your hand, then replay him to accelerate your mill? just an idea