Terrageddon's game plan is to develop a threat — typically Nimble Mongoose or a rapidly-growing Terravore — and then resolve Armageddon or Cataclysm to strand you without mana to respond. Your priority is to deploy threats as fast as possible and destroy their Mox Diamonds before they can use that acceleration to get ahead on tempo; both Hull Breach and the additional Naturalize copies are excellent here, also answering Seal of Cleansing and their Sylvan Library. Rancor is a liability against a deck running four Swords to Plowshares, since exile removes the creature from the game and sends the enchantment to the graveyard. Ravenous Baloth is your best threat in this matchup — it dodges Swords to Plowshares by sacrificing itself in response and gains you life to offset any incidental damage from Fire or their creatures. Mogg Fanatic and the lower-impact burn (Lava Dart, Seal of Fire) are cut because they do almost nothing meaningful against Nimble Mongoose (which has shroud), Terravore, and Anurid Brushhopper.