Toxic Deluge is a crucial sweeper against Death and Taxes' go-wide plan of Recruiter of the Guard, Stoneforge Mystic, and Aether Vial-fueled hatebears, letting us reset the board on our own terms. Abrupt Decay answers Stoneforge Mystic, Thalia, Guardian of Thraben, or an equipped threat uncounterably, dodging their own Swords to Plowshares and Solitude only matters for our side, not theirs. Sylvan Safekeeper is weaker here since Karakas already answers our legendary threats and their removal is efficient, so it and slower cantrips trim out. Keep Thoughtseize to strip a key piece like Overlord of the Balemurk or Stoneforge Mystic before it lands.