Ruby Storm wins by chaining rituals through Ral, Monsoon Mage and finishing with Grapeshot or Empty the Warrens, so your primary goal is to disrupt their mana and tempo before they go off. Vexing Bauble taxes free cantrips like Manamorphose and punishes their zero-cost storm acceleration, while High Noon prevents them from casting multiple spells in a single turn and can single-handedly lock them out of going off. Orim's Chant is your most powerful disruption — cast it on their turn when they're assembling, naming 'cast spells' to blank their entire combo turn. Solitude and Reprieve come out because creature removal and bounce are nearly dead against a combo deck with minimal permanents; Sunken Citadel has no function here and tapping lands tapped is actively dangerous in a race where you need all your mana open for interaction.