Ruby Storm has almost no creatures to kill, so our removal spells are largely dead weight; instead we need cheap, efficient counterspells to stop their combo turn. Consign to Memory can counter their colorless spells and any relevant triggered abilities, like Ral, Monsoon Mage's flip trigger, while Mystical Dispute doesn't get its discount against their all-red spells but is still a serviceable generic counter for their key noncreature spells like Past in Flames or Hex Magic. Force of Negation and Counterspell remain crucial as our primary answers to their rituals and payoff spells, so keep those in at full count. Prioritize countering their payoff spells (Past in Flames, Grapeshot) over the cheap cantrips and rituals when possible.