Mono-Red Sligh is an all-red burn deck, making Hydroblast extremely effective at both countering their spells (Lightning Bolt, Incinerate, Fireblast) and destroying red permanents (Sulfuric Vortex, Seal of Fire, Pyrostatic Pillar). Essence Flare helps neutralize Grim Lavamancer or Jackal Pup as blockers/attackers shrink over time, though it is slow against a hyper-aggressive plan and mainly buys time. Prioritize surviving the early damage race with cheap counterspells (Daze, Foil, Counterspell) and life-preserving Gush timing. Board out clunkier or slow cantrips that don't address the race, like extra Impulse and Peek.