You get it after an event in the story. Rinoa goes into 'Magic Berserk' mode, the damage of spells is multiplied by five*,and she randomly casts spells in her inventory without using up her stock. (So you could give her one spell, like Meteor, and she'll cast that over and over without using it up.)
It's pretty useful. I still like Zell's better.
*thank you for correcting me.
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