It’s an Actionscript 3.0 controlled Steam-Ghost-Smoke-Particle effect. You can fast create your own Steam-Ghost-Smoke-Particle Effect and use it as cursor, add this effect to a scene as a smoke of a big factory, a steam of a cup of coffee or fireworks. You can edit next effect parameters: position; color; blur intensity; direction; speed; intensity; size of particles;
And you can add any number of these Magic elements to the scene in seconds. Here is a good manual and examples that will help you build your effects.