Lifegain wants to go wide with cheap value creatures like Hinterland Sanctifier, Deep-Cavern Bat, and Voice of Victory, so Split Up sweeps their board whether they're tapped from attacking with Voice of Victory tokens or sitting back untapped. Seam Rip exiles key two-mana-or-less pieces like Hinterland Sanctifier or Deep-Cavern Bat before they generate incremental life-gain value, returning any card exiled by the Bat. Erode gives them a free land, which is bad against a grindy lifegain deck that wants time, and Nurturing Pixie's 1/1 body doesn't meaningfully impact a matchup about grinding out card and life advantage. Keep Aang, Swift Savior and our flyers to keep pressuring through their lifegain buffer.