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Mana ramp in the form of utopia sprawl and arbor elf lets me get the expensive aurochs out quickly with the tinder walls and Garruk providing alternative options. Hibernations end provides a form of card draw so aurochs actually come out. Bubble Matrix lets me use the aurochs as chump blockers despite their low toughness and attack without fear of dying while trample damage still gets through. Steely resolve protects the aurochs from creature destroy. Overrun for finishing people off.
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