Initial implementation for:
[card]59i[/card] [card]4ve[/card]
This is not doing the typical <img... tag stuff. Instead I am grabbing the SVG source and embedding that in the page. This is proving to work much better than <img... since for some reason using that method was leaving out the card header image.
Test out the feature in this thread and let me know if there are any issues. I'm not currently doing any sanitizing or sanity checks for what is between the card tags. You can thank serprex for the SVG output, let him know of any issues with the SVG itself.