Let's celebrate - it's my first ever case of art theft!
Found this on a Magic Card fan site: http://magic.tcgplayer.com/fantasy/030526.asp
This is an odd situation though - does it count as theft? While the person who ripped it didn't ask for my permission (obviously) they DID include my copyright info on the card... (By the way, these are fan-made Magic Cards and I don't believe there is any money being made off of them).
So this wasn't malicious or anything. Still, no one asked me for permission to use the image, so I asked that it was removed.
It seems that art theft is more or less promoted on this site however, judging by this disclaimer: "If you are an owner of a piece of artwork used, and would like it removed, notify a Brainburst.com editor."
So yes - you guys may want to look over the site to see if anyone is using your artwork for these cards; anything is fair game until the artist blows the whistle.