Ruby Storm has almost no creatures, so Fatal Push and Walking Ballista are mostly dead removal here; Agatha's Soul Cauldron is too slow against a deck trying to kill from zero board presence. Kraul Harpooner adds cheap pressure as a 3/2 body, and its reach and enter-the-battlefield fight give it a way to deal with their rare Stormscale Scion, a 4/4 flying Dragon from their sideboard. Thoughtseize strips a key piece like Reckless Impulse, Hex Magic, or Past in Flames before they can assemble their storm turn, and Keen-Eyed Curator exiles cards from their graveyard to shut off Past in Flames rebuys while growing into a relevant threat. Keep the full mana engine and combo pieces intact since this matchup is primarily a race against their clock, not a grindy one requiring sideboard answers to their board.