Sultai Aluren relies on green and blue spells like Veil of Summer, Show and Tell, and Force of Will to protect its Atraxa/Omniscience plan, so we lean on our mainboard Veil of Summer copies, which give us hexproof from blue and make our spells uncounterable for the turn, to push our own combo through their Force of Will. Boseiju, Who Endures is a cheap way to blow up their City of Traitors or Ancient Tomb to slow their fast mana: its channel ability costs {1}{G} and discards the card, and it can also hit Aluren or Omniscience. We trim two lands, Taiga and Badlands, to make room for the two Boseiju, since this matchup is more about resolving our own protected combo than fixing for every color.