Trinisphere is devastating against Doomsday, forcing every spell to cost at least three mana and completely breaking their Dark Ritual into Doomsday into Lion's Eye Diamond combo turns. Faerie Macabre can strip Street Wraith or graveyard pieces (like a discarded Doomsday pile card) and is a clean flash flyer that doesn't ask them for permission. Chalice of the Void at one is already a mainboard lock against their entire cantrip/ritual suite, so keep the full package. Cut Chrome Mox since giving them any extra information or resources is unnecessary risk, and trim Sheltered by Ghosts since it is a slower, more reactive card against a deck that just wants to resolve one spell and win.