Text (ET+errata): 2/1, Flying. ; When ~this~ enters the battlefield, draw a card if you've cast another blue spell this turn. [Oracle 2009/07/08]
It checks if you played a blue spell (other than itself) during its resolution, so you can play this, then respond to it with a blue spell and still have it trigger. [Eventide FAQ 2008/07/08]
The ability works fine even if this card is put into play without playing it as a spell. [Eventide FAQ 2008/07/08]
