Pyroclasm sweeps their Guide of Souls (a 1/2), Ocelot Pride, and the Cat tokens, which make up the bulk of their board. Minsc & Boo adds a resilient threat that survives Swords to Plowshares' single-target nature and can grind through their removal-heavy plan. Price of Progress stays in the sideboard: both decks run a heavy nonbasic manabase (fetches, Wasteland, dual lands), so it would hurt us about as much as it hurts them. Boomerang Basics comes out since it is too slow against their token swarm.