I would definitely take out the Bascilica Screechers for some Rakdos Drakes. I would also take out 1 Ash Zealot and 1 Legion Loyalist for 2 Chaos Imps. Chaos Imps is an amazing late game unleash card.
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I would take out a Dreadbore and put another Rancor in. Its a known fact that Rancor wins games on its own.
That would be a good card to put in the deck, but I am making the deck standard and that card is not standard.