Sultai Aluren's plan revolves around Aluren enabling free, repeated Acererak casts and Show and Tell putting Omniscience or Atraxa onto the battlefield. Leyline of the Void goes onto the battlefield at the start of the game if it's in our opening hand, and it exiles any card that would go to their graveyard. That shuts off graveyard-based plays, which matters most if they bring in cards like Bilbo. Force of Vigor is a two-for-one against Aluren plus another artifact or enchantment, or against Omniscience or any other enchantment they land. It can be cast for free on their turn by exiling a green card from our hand. Thoughtseize is weak here since they're a combo-value deck that can rebuild through Brainstorm/Stock Up and isn't hurt much by single-card discard once Aluren resolves. Sylvan Safekeeper and Crop Rotation aren't impactful against a deck that doesn't attack our board or care about land destruction.