Ruby Storm wants to chain cheap rituals and cantrips (Desperate Ritual, Pyretic Ritual, Manamorphose, Wrenn's Resolve) into a lethal Grapeshot or Past in Flames turn, so Trinisphere is devastating. It taxes every one- and two-mana spell in their combo chain up to three mana, which badly disrupts their mana efficiency: a ritual that costs three mana to produce three mana no longer gets them ahead. Vexing Bauble stays in the sideboard. It only counters spells cast without spending any mana, and nothing in their deck is cast that way, so it has nothing to hit. Cut Green Sun's Zenith since it doesn't interact with their combo and is too slow when you need to either race or disrupt. Prioritize landing Trinisphere as early as possible, ideally before they've assembled enough mana acceleration to pay around it.