Ruby Storm wants to chain cheap rituals and cantrips like Desperate Ritual, Pyretic Ritual, and Manamorphose into a lethal Grapeshot or Past in Flames turn, so taxing their mana and spell count is the priority. Damping Sphere is excellent here since each spell a player casts costs {1} more for every other spell they have already cast that turn, which directly punishes their storm count and ritual chains. Grafdigger's Cage stops players from casting spells from graveyards, which shuts off Past in Flames and Flashback recursion lines. We keep Orcish Bowmasters in, because Manamorphose's "Draw a card" is an extra draw outside their draw step and triggers it. We trim Thoughtseize, since paying 2 life for a single card is less valuable here than the hate pieces coming in. We also trim Street Wraith: Ruby Storm has no Swamps, so Swampwalk does nothing, and a 5-mana 3/4 is too slow against a deck that can go off in a single turn.