This stamped promo celebrates the Cosmic Eclipse set, though it did not appear in packs with the stamp, instead appearing only in specially marked products, like three-pack blisters
Adding Shuriken Flurry into the mix (applying 3 Damage Counters to an opponents Pokemon when Greninja GX is played), this card offered a lot of potential in a match
Final Fantasy has an artifact theme in Esper led by Noctis, Prince of Lucis, which lets us cast artifacts from our graveyard, and supported by cards including Golbez, Crystal Collector, Ashe, Princess of Dalmasca, and Edgar, King of Figaro
Its also going to slightly simplify Flair, by which you add special twinkly effects to your cards, and no longer require you to spend shinedust to apply themgiven shinedust is now required for trading, that surely ensured no one was ever bothering with Flair anymore, likely prompting the change
It's not often you get somebody so far removed from Pokemon signing a card, though, and even less common that PSA will authenticate it
