Slitherwisp
{U}{B}{B}
Creature — Elemental Nightmare
Oracle Text
Flash
Whenever you cast another spell that has flash, you draw a card and each opponent loses 1 life.
Watch Out
Cast trigger fires even if counteredWatch Out
This triggers when the spell is cast, before it resolves. Even if the spell is countered, the cast trigger still resolves. Copies of spells are not cast, so they won't trigger this.