Thoughtseize lets us proactively strip their Force of Will or Daze before jamming a key threat, and helps us play around their disruption-heavy plan. Endurance answers Murktide Regent by resetting its delve fuel and can be evoked for free to blank a graveyard-dependent draw. Once Upon a Time is weaker here since it doesn't fight through countermagic, and Quirion Ranger's mana-fixing utility is less relevant against a deck without Wasteland-heavy mana denial pressure on our side. Keep the core ramp-into-threats plan intact since we need to present overwhelming board states they can't answer one-for-one.