Ruby Storm wants to chain cheap rituals and cantrips into a lethal Grapeshot or Past in Flames turn, so Thoughtseize taken early can strip a key piece like Past in Flames or a ritual before they go off, and the 2 life loss is negligible against a deck with no early clock. Our own plan of fast sacrifice value and life gain from Cauldron Familiar/Gilded Goose doesn't need much adjustment since they have almost no removal for our creatures. Explosive Prodigy and Haywire Mite are cut since they don't meaningfully disrupt a storm combo turn. Prioritize proactive discard over trying to counter their spells, since we have no countermagic in the 75 relevant to this plan.