Kor Spiritdancer

• WWizards of the Coast2010-06-15
  Official Ruling
  The second ability triggers when you cast any Aura spell, not just one that targets Kor Spiritdancer.
• WWizards of the Coast2010-06-15
  Official Ruling
  If you cast an Aura spell, Kor Spiritdancer's second ability triggers and goes on the stack on top of it. The ability will resolve before the spell does.

Rulings via Scryfall