Text (US+errata): 3/2, Flying. ; When you cast a creature spell, sacrifice ~this~. [Oracle 2009/07/08]
The triggered ability triggers when the creature spell is announced, and it is put on the stack before any responses can be played. This ability will resolve before that creature comes into play. [D'Angelo 2000/01/02]
A creature spell is any "Creature" or "Artifact Creature" spell. [D'Angelo 1999/05/01] Older cards of type Summon are also Creature cards.
