It's weird that it does exist. The vast majority of cards that debut in Collector's Packs are taken directly from the anime. Toon Ancient Gear Golem's appearance in the anime wasn't as a physical card, it was a Comic Hand'd version of Crowler's Ancient Gear Golem.
That is true, but a tad different. The first wave of Toons, such as Mermaid and Blue-Eyes, were released IRL before they appeared as physical cards. But later Toons were all physical cards (as were the older ones in later appearances). Toon Ancient Gear Golem was never a card in the anime. Also, as I mentioned, the Collector's Packs are dedicated to releasing anime cards. Toon AGG was never a card