It was printed as a PROMO card for Duels of the Palneswalkers 2012. If you preordered DotP 2012 on X-box, you were shipped this card. It was mis-credited to Nils Hamm, but there is a physical card. I still have some that I'm selling. Send me an email if you're interested.
Such a misfortune indeed. Took me a while to realize this was yours due to the miscredit. I prefer this one over the Hamm version, and traded half of my regular titans away to have them with this image instead. Your artwork is among my favorites when it comes to the cards, keep up the great work.