Lands is a green and colorless land-based deck with no blue or red cards, so narrow hate pieces like Blue Elemental Blast have no legal targets and should stay in the sideboard, and Containment Priest has little to do here. This deck doesn't offer good sideboard targets for us, so we make no swaps and keep the main deck as is. Prismatic Ending stays in because it can still exile cheap artifacts like Pithing Needle or Disruptor Flute and a Marit Lage token, even though it can't hit Dark Depths itself (a land). Wasteland and Stifle remain critical maindeck tools: Wasteland punishes their nonbasic lands like Dark Depths and Thespian's Stage, and Stifle can counter the Marit Lage trigger and Urza's Saga abilities.