BRG grinds with Lively Dirge recursion and sacrifice synergies like The Sackville-Bagginses and Biotech Specialist, so Sunspine Lynx punishes their nonbasic-heavy manabase (Blooming Marsh, Overgrown Tomb, Stomping Ground, Blazemire Verge) for extra damage, though it hits us for our own nonbasics too. Sear's 4 damage cleanly answers Smaug the Magnificent and Umbral Collar Zealot, which unkicked Burst Lightning can't always finish, but it won't kill Rottenmouth Viper (6/6) or Wolverine (3/5), so don't count on it for those. Secret Identity is weak here because it only protects one creature for a single turn, which doesn't do much against a deck that wins by grinding out value with recursion and sacrifice effects, and Vibrant Outburst's 3 damage is a step down from Sear's 4. Keep pressure high since this matchup is a race against their grindy card advantage.