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Well I would say 5-10 bucks. It's a promo card from Pokemon the Movie. Nice card you have there. I will buy it if you don't want it. *Then I would have 3*
My copy was stolen unfortunately, with my wallet, but I got it off a collector (who also had a bunch of fake cards, I think it may have been fake) for about 2$.
It's called Ancient Mew, and it was given away as a promo for the movie from 2000. Now, the interesting thing about this card is that there were actually three versions; One printed with a dark colour, one with a lighter colour, and one that was included in a promo book from Japan https://cgi.ebay.ca/POKEMON-JAPANES...emQQptZLH_DefaultDomain_0?hash=item563a72a718 (don't be confused by the listing details, the error card did come in one of these books, I just couldn't find any other image of the actual book.) The one that was included with the book is worth a lot compared to the others, and this is because it was printed with an error; it says "Nintedo" on the bottom instead of "Nintendo". But, unless you got this book, you didn't get the error, you got one of the two versions I mentioned from the movie. It's hard to tell from the image, but it looks like you have the lighter version.
Anyway, both of the regular movie versions are only worth about $2.