The Glow Card is defiantly one of the most beautiful cards out of them all. It's power is to create firefly like objects that float everywhere. As you can see by the picture below, these tiny balls of light are very beautiful.
In Episode 18, Glow appeared during the Summer Festival in Reidenton. It's unknown at this current time how Glow was captured, for this episode didn't make it to North America. However, when summoned it creates hundreds of tiny balls of glittering light. This was useful during the Sakura Card series, in Episode 67.