Terrageddon wants to Armageddon you back to parity then win with an overgrown Terravore, so Gaea's Blessing lets you rebuy and reshuffle key cards (and refill your library) after a land-destruction exchange while also replacing a draw step. Chainer's Edict and Smother are weak against Terravore, which can grow too large, and against a deck that often has few creatures in play early, so swap them out for the additional Duress copies that strip Armageddon or Swords to Plowshares before they resolve. Keep Treetop Village and Dust Bowl online since recovering board presence after Armageddon matters more than ever. Wall of Roots and Genesis help rebuild mana and card advantage post-Armageddon, so leave the engine untouched.