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Modified version of the Infect and Defile Event Deck. I went 3-1 in my first Standard tournament, so I'd appreciate any tips for improving this deck! (I was playing against people using Valakut and Primeval Titan+Hydra-based decks mostly. I usually won the first game easily, lost the second easily, and barely lost the third.)
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I went along the exact same line as you, starting with the Infect and Defile deck. This is what I came out with: http://www.mtgvault.com/ViewDeck.aspx?DeckID=197178
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How about some mutagenic growth?