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Kozilek, Butcher of Truth can be replaced by It That Betrays

Run it, love it

Combine that with the fact that Summary DismissalSummary Dismissal or even DissipateDissipate are strictly better cards for the format, and I don't think Ashiok's ErasureAshiok's Erasure will get much love

Having extra Reunion effects in hand is not a bad thing, but theres a chance they wont be used because they will be discarded thanks to Ox of Agonas if you have the option of casting yet another Reunion or Reunion on legs that will trigger Amalgams, its very likely that getting a guaranteed 5/3 on board will be better

Scrye - The Game Card Collector's Guide , no