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.
15-06-2010
wotc
The second ability triggers when you cast any Aura spell, not just one that targets Kor Spiritdancer.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.