Jeskai Control's manabase is loaded with nonbasics (Great Hall of the Biblioplex, Steam Vents, Sacred Foundry, Gloomlake Verge, Hallowed Fountain, Shattered Sanctum, plus many Verges), so Sunspine Lynx's ETB damage punishes them significantly on a turn they can't easily interact with a 5/4 creature. Witchstalker Frenzy is too clunky against a deck with few early blockers and Day of Judgment/Pyroclasm-style sweepers looming; Shock is too small to matter once they stabilize. We keep our low curve otherwise to race before Jeskai Revelation and Great Hall take over.