Diabolic Edict forces a sacrifice that bypasses Phyrexian Dreadnought's protection since it doesn't target, making it clean removal once Stifle or Vision Charm has already saved the Dreadnought trigger. Annul stops a second Vision Charm or any Powder Keg, while Tormod's Crypt is mostly a sideboard slot filler here but can disrupt their Gush/graveyard interactions and is nearly free. Duress is weak since they have few noncreature threats worth stripping beyond protection spells, and Sickening Dreams is dangerous to cast against a deck that can win in two swings. Keep Counterspell, Foil, and Smother in as your primary interaction against the Dreadnought and their support spells.

Annul is the key sideboard card here, countering Opalescence, Parallax Wave, or Attunement before the lock engine comes online. It can't touch Replenish, which is a sorcery, so Counterspell, Foil, and Mana Leak have to handle that. Blue Elemental Blast is left in the sideboard because the opponent has no red cards, so it has no legal targets. Tormod's Crypt takes its slot: with Replenish as the payoff, exiling their graveyard in response leaves it with nothing to return. Duress is less useful against a deck that often empties its hand into enchantments on the stack rather than holding reactive cards, so some copies are trimmed along with Peek. Counterspell, Foil, and Chain of Vapor remain crucial to interact with Opalescence and bounce key enchantments before Replenish resolves.

Terrageddon wants to Armageddon into Terravore and Call of the Herd tokens, so Diabolic Edict is clean, unconditional removal for their undercosted threats regardless of size. Nausea can clear a board of Wild Mongrel, Werebear, and token Elephants in the early game before Terravore grows huge. Sickening Dreams is too risky once Armageddon strips your mana, and Peek offers little against a deck you're racing on board state rather than info. Keep Counterspell, Smother, and Duress in to disrupt their land-destruction and threat deployment before Armageddon locks the game.