Ruby Storm needs to chain many cheap spells together in a single turn to go off with Grapeshot or Empty the Warrens, and Damping Sphere's tax on each subsequent spell in a turn makes that chain prohibitively expensive. Surgical Extraction can strip a key piece like Past in Flames or an early ritual straight out of the graveyard, denying a rebuy. Trim the slow, mana-intensive Arena of Glory activations and one Chandra's Incinerator to stay maximally efficient, since this matchup is about applying pressure fast enough that a single stumble ends their combo turn before it starts.