Ditto is a pokmon known for it's ability to transform into objects and other pokmon
Well, a 4/4 for 3 with no other abilities would see a lot of play, so I guess were paying 1 mana for the ability
After relaxing at Costa del Sol, stop by the Gold Saucer
Allowed sets : Alpha, Beta, Arabian Nights, Antiquities, Legends, The Dark, Fallen Empires, Harper Prism Book Promos, Ice Age, Homelands, Alliances, Mirage, Visions, Weatherlight, Portal, Tempest, Stronghold, Exodus, Portal Second Age, Urzas Saga, Urzas Legacy, Urzas Destiny, Portal Three Kingdoms, Starter 1999, Mercadian Masques, Nemesis, Prophecy, Invasion, Planeshift, Apocalypse, Odyssey, Torment, Judgment, Onslaught, Legions, and Scourge (every Old Frame set except Unglued)
I am not including it in the 2 next ranks, but I would pick only Rakdos Headliner over him in these lists
Note however that individual stores could still choose to give away the cards at their own discretion, despite Gamestop's official documentation