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I feel that adding the small amount of black adds the edge that RG fat needs. Sire could strictly be a sideboard card. But I feel that with this type of deck it's easy to dump your hand fast and force your opponent into turn by turn situations once it's out. I also like having the option of switching the Mizzium Mortars to Dreadbores against Esper and mirror matches with hard to get rid of 4 drops. I enjoy playing it, and believe that Underworld Cerberus has a shot at seeing constructed.
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