2016 WBEI San Diego Comic-Con Exclusive Supergirl Martian Manhunter Foil Promo Card

I'd pretty much decided that I wasn't going to do a post late on a Friday night, knowing that there'd be few interested in reading anything over the weekend. However, Kevin from New Orleans asked about whether there were any other trading cards featuring David Harewood as J’onn J’onzz in Martian form, and I figured a quick peek wouldn't do any harm. As it happens, the answer is kind of yes and no. For instance, the Supergirl TV show began in 2015, with the Martian Manhunter reveal coming in December. The season wrapped in April of the following year, with the physical media set released in August. The San Diego Comic Convention occurred on July 21–24, and this metallic foil trading card was given away at that event. It's got many of the key points of the Invisible Sleuth's role in that season on the back of the card, but it's just a free promo divorced from any set. Does it count as a trading card if it was never circulated as such?