Ruby Storm's real win condition is Seize the Storm making a huge trampling Elemental token off a graveyard full of instants and sorceries, so pressuring their cost-reducing creatures and racing before the big turn comes online is key. Tragic Slip is cheap, efficient removal for Goblin Anarchomancer or Thornscape Familiar, slowing down their mana reduction before they can chain rituals. Nihil Spellbomb can exile their graveyard to shrink or deny a Seize the Storm token, since its power and toughness are based on instants and sorceries in the graveyard. Snuff Out is weak since it costs 4 life against a deck that's often racing us on an empty board, and our mana is better spent on cheap proactive removal; Sadistic Glee is too slow to matter before they combo off.