Prismatic Ending is useful here as a cheap answer to their small noncreature permanents. With white and blue mana it can exile anything of mana value 2 or less, such as Exploration, Mox Diamond, Pithing Needle, Grafdigger's Cage, or a Disruptor Flute. It cannot touch Dark Depths or Urza's Saga, because those are lands and Prismatic Ending only targets nonland permanents. It also cannot handle Icetill Explorer, which has mana value 4. Celestial Purge is mostly dead against this deck, since nearly everything they play is green or colorless. The exception is Marit Lage, the black 20/20 token Dark Depths creates, and Purge can exile it at instant speed as an extra answer alongside Swords to Plowshares. Daze is weak because Lands wants to deploy threats and lands proactively rather than race on tempo, and giving up a land to counter a spell is too costly against their land-based grind, so all three come out. Stifle stays in at full strength: it can answer the Dark Depths trigger, Urza's Saga and Thespian's Stage activations, and their fetch-style land abilities. Crop Rotation is an instant spell, so Stifle can't hit it, but Force of Will and Consign to Memory (which counters colorless spells and triggered abilities) can handle their other plays. Containment Priest is not brought in: Marit Lage is a token and the Priest only exiles nontoken creatures that enter without being cast, so it does nothing against their combo.