The top layer, the disguise for the ditto, is not tournament legal, however the Ditto card itself is, and has a pretty unique ability called Sudden Transformation, which allows this card to use any attack of a basic Pokemon in the Discard pile
If it doesn't meet the criteria, that card is up for consideration to be banned
Not to mention, the blue hue of the Constructs body makes for a stark contrast against the gold frame to help make this card look impressive on a battlefield
3 Chaos, the Endless Circle of Power Cloud of Darkness Dark Knight's Greatsword Demon Wall Evil Reawakened Exdeath, Void Warlock Fang, Fearless l'Cie Gaius van Baelsar Garland, Knight of Cornelia Judge Magister Gabranth Locke Cole Neo Exdeath, Dimension's End Overkill Phantom Train Poison the Waters Ragnarok, Divine Deliverance Reno and Rude Rufus Shinra Shambling Cie'th Sidequest: Hunt the Mark Summon: Anima The Final Days Tonberry Ultimecia, Omnipotent Ultimecia, Time Sorceress Yiazmat, Ultimate Mark
Many won't have anything out that early