Force of Vigor is excellent against their artifact-dense manabase and threats, hitting Giant's Boulder or Karn, the Great Creator's animated artifacts, and can be cast free off a green card to blow up their mana on their turn. Endurance can flash in to reset our own graveyard against their Kozilek's Command, which can exile our graveyard resources. Once Upon a Time doesn't interact with their lock pieces or countermagic, making it a low-value inclusion here. Collector Ouphe stops activated artifact abilities but doesn't stop Karn's static effect, so it stays in the board in favor of the more impactful Force of Vigor copies.