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In other words, you'll have your sideboard plans for the most common versions of the most common decks, but you'll inevitably be forced to adapt to small variations on these decks

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While it's likely a bad fit for your K'rrik, Son of Yawgmoth storm deck and other black decks that aren't running many creatures, Contamination is perfect for commanders like Nath of the Gilt-Leaf that can play green mana dorks and reliably produce creatures to sacrifice to keep it around

Perhaps this might be a good reason to bring them back so you can dish out heavier damage to your opponents, though you risk it getting stuck in your hand as a meager Shock as well