The owner of this deck hasn't added a sideboard, they probably should...
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Not very legit or even remotely competitive, but I saw the combo and just wanted to make it known.
Get Countryside Crusher onto the battlefield, next turn reveal minimum 19 lands until you hopefully hit fling, then fling the giant Countryside Crusher if the attack doesn't go well. Also, you could just mulligan infinitely until your starting hand has one of the Countryside Crusher, and your almost guaranteed to drawn enough lands to play it.
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