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In this blue/black deck, use the transmute ability found on most creatures and spells to find the right cards for the situation at hand. You can play the transmute ability from your hand or from the field so if you feel like you need some defense you can wait to transmute. There are plenty of cards in this deck to force your opponent to lose a lot of cards, then you can eventually transmute for Ob Nixilis, the fallen, who has a great landfall effect based around the deck.
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