A Pichu!
This card was part of the 2009 Pokémon Card Design Contest as you’re already aware, but unlike the other cards from that set which only between 12 and 120 exist (which most of are currently on my wish list at $700 per card), the designer of this one was from the contest advertised in Japan’s Weekly Shonen Sunday magazine, which went on to freely distribute the winning entry en masse to anyone who purchased the issue of the magazine which followed the print run.
It’s a great card to own and hold on to, although I may be bias as a Pichu collector, but it’s certainly not likely to shoot up in value any time soon I’m afraid. The card you’ve picked up is almost always available ungraded on sites like eBay, whereas the others from that contest very, very rarely show up.