Artisan's Advantage is one of the possible Super Kupowers granted at random after all 11 Mog Tablets have been found and returned to the Explorer Moogle in Ru'Lude Gardens.
Artisan's Advantage: The chance of losing ingredients in a failed synthesis attempt is drastically reduced while the crafter has Synthesis Image Support from their respective guild (and possibly regardless of Synthesis Image Support).
Artisan's Advantage: Harvest results from Gardening are improved under Artisan's Advantage. You receive more of the desirable results and fewer "junk" results.
The Japanese name for this is 'Lucky Meister'.