Selesnya Landfall's engine runs on landfall triggers feeding Earthbender Ascension, Mightform Harmonizer, and Mossborn Hydra, and those are triggered by lands entering, so Torpor Orb (which only stops triggers caused by creatures entering) does nothing to them and stays in the sideboard. Instead we lean on sweepers: two more Day of Judgment give us a clean reset against their landfall-pumped creature board. Authority of the Consuls makes their creatures enter tapped while gaining us life, which blunts their pressure. Boomerang Basics and Braided Net are too slow to keep pace with their land-based value engine, so they come out.