Touriel, Vixen of the Lawful

Spectacle {b}{r} (You may cast this spell for its
spectacle cost rather than its mana cost if an opponent
lost life this turn.)

Whenever an opponent casts a noncreature spell, Touriel, Vixen of the Lawful deals 1 damage to
that player.
Creatures you control get +1/+0 as long as an opponent lost life this turn.