Jund Sacrifice runs multiple nonbasic land cycles (Blazemire Verge, Blooming Marsh, Starting Town, Overgrown Tomb, Stomping Ground, Wastewood Verge), so Sunspine Lynx punishes their manabase for solid chunks of damage on a resilient flying body. Witchstalker Frenzy is clunky since it needs an attacker in combat first and their small sac-fodder creatures (Callous Inspector, Gene Pollinator) don't need 5 damage to be dealt with; Shock is too small to matter once bigger threats like Rottenmouth Viper show up.