This matchup is a race against their land-disruption package — Armageddon with a Terravore in play is almost always lethal, so you need to be applying pressure and threatening lethal before that can resolve. Hull Breach is the key sideboard card: destroying Mox Diamond slows their ability to play through Wasteland and Port, and it also answers Sylvan Library and any post-board Zuran Orb. Ravenous Baloth comes in as a 4/4 that survives their Pyroclasm (which they will bring in against your creature base), and the life gain buys critical time if they manage to stabilize the board with a large Terravore. Pyroclasm handles Weathered Wayfarer efficiently and cleanly answers Meddling Mage if it resolves post-sideboard. Rancor, Seal of Fire, and one copy of Naturalize come out because Rancor is a liability against Swords to Plowshares (a 2-for-1 against you), Seal of Fire is too slow and too weak against their threats, and Hull Breach outclasses the third Naturalize in this matchup.