User blog comment:FairyRaven/One-time-only Spells/@comment-16344653-20120709131303/@comment-5268982-20120709155056

Hahah, some of the answers were really well-thought but some others were just funny! I appreciate the long comment though. For example, about Hibiki, he may could use it by himself but entrusted it to Lucy because his magic power was low at that time. He was pretty exhausted after all. In addition, Lucy practising and learning Uranometria is just a speculation, since it was never shown in the manga. However I agree that it's the most possible scenario.

Now, about Fairy Glitter. First of all, of course it's Mavis', but since Cana is the only one who's used it so far I have kind of connected it with her...anyway, the only point I think that can still be discussed about FG is the last one. Fairy Glitter sure is strong, but when used on Bluenote it looked like it was a failure (because of Cana being weak, of course). After all, Mavis talked about Cana's magic power and Gildarts' blood running within her veins when used on the games, so for a magic attack to be strong it probably requires the combination of Powerful Spell + Sorcerer with high magical power. Of course, Fairy Glitter did not make Cana's Magic stronger, but Cana's magic did make Fairy Glitter stronger.