Ruby Storm's only win condition is Seize the Storm making a trampling Elemental token, so Weather the Storm's life gain, copied via storm for each prior spell cast that turn, buys crucial buffer against that one big swing. Rolling Thunder is flexible removal or reach that can finish the game or snipe their Goblin Anarchomancer/Thornscape Familiar cost-reducers before they go off. Lose Focus is weak since countering one ritual spell rarely stops the full chain, so we trim it along with one Moment's Peace and one Pulse of Murasa since this matchup is about surviving one big trampling hit rather than grinding combat damage.