Lifegain relies on a wide board of small creatures like Hinterland Sanctifier, Deep-Cavern Bat, and Starscape Cleric to fuel Amalia Benavides Aguirre and Lunar Convocation, so Slagstorm's 3 damage sweep is very effective at clearing their support pieces. Colorstorm Stallion provides resilient pressure that punishes their grindy, defensive shell since they have little removal to interact with a 3/3 ward creature. We trim the top-heavy Traumatic Critique copies and narrow Spell Snare/Get Out since this matchup is about applying consistent pressure and sweeping their board, not reactive tempo plays. Keep Hearth Elemental and Eddymurk Crab as primary damage sources to close the game before their life gain engine stabilizes.