Mystical Dispute cheaply answers their blue spells like Subtlety, and against another blue spell it costs only one mana. Dress Down strips abilities from their reanimated Waker of Waves or Curator of Mysteries if Living End resolves, though our priority is countering Living End with counterspells like Force of Negation and Counterspell, since it is cast as a spell and can be countered. Spell Snare has few great targets since most of their key cards like Living End (which has mana value 0, not 2) aren't legal targets, so trim slightly. Keep Thoughtseize and our full counter suite to strip or stop their key spells before Living End resolves.