Custom Card Art

Hey, I was wondering if there's any way you can use custom art for your cards without having to replace the actual art for them. So for example, Embermaw Hellion has a single art in the list, but what I'd like to be able to do is add a second Embermaw Hellion that works exactly like the first without having to erase the art for the first. Is this something that's possible or do I have to overwrite the art on the one that's there?