One night, after a huge fight with his wife, Hironobu Yoshida had driven to a nearby hotel. He was trying to sleep, but it just wasn't as comfortable as his bed back home. As thoughts raced through his head, his mind eventually settled onto his favorite Pokémon: Mew. But not just any Mew...no, he was thinking about shiny Mew. Having unbelievably brought art supplies with him to the hotel, he decided to sketch the elusive Pokémon.
...no, I don't know. I really don't think there is too much else to learn about the card. You asked for when it was released and a background, and I don't really think there's much more you could possibly get. What kind of background information were you looking for, exactly?