WUBG relies on Oath of Druids to cheat Terravore into play, and Naturalize is a clean, efficient answer to Oath of Druids itself or Sphere of Resistance, both of which are backbreaking for us to leave unanswered. Krosan Tusker comes out since it is slow and its toughness doesn't matter against their removal-light but Wasteland/Rishadan Port-heavy manabase disruption plan. Duress and Cabal Therapy remain critical to strip Oath of Druids or Swords to Plowshares before they can use them, and Pernicious Deed stays in as our best way to answer an Oath-triggered Terravore.