Mono-White Humans goes wide with Adeline, Resplendent Cathar and Thalia's Lieutenant counters, so Get Lost is premium removal for Adeline or Thalia, Guardian of Thraben before they snowball. Beza's extra bodies and life gain help you survive their token swarm and stabilize on the ground. Your own Thalia is symmetrical and doesn't slow them down meaningfully since they're also a low-curve creature deck, and Enduring Innocence dies easily to their efficient removal while not blocking well against their aggressive curve. Keep Skyclave Apparition and Collected Company since Skyclave Apparition answers Adeline or Thalia's Lieutenant outright and denies their token-boosting payoffs.