Lifegain wants to stabilize with Hinterland Sanctifier gaining life as creatures enter to power Amalia Benavides Aguirre and Moseo, Vein's New Dean, so Seam Rip proactively exiles Amalia or Hinterland Sanctifier before their life-gain engine snowballs. Split Up sweeps their wide board of small lifegain synergy creatures and tokens, resetting the life-gain triggers they depend on. Burst Lightning struggles once Amalia Benavides Aguirre grows with explore counters or against sturdier bodies like Haliya, Guided by Light, and Twinmaw Stormbrood's life gain is redundant against a deck already trying to out-life us, so we cut both for more proactive answers that attack their engine pieces directly.