As you can probably guess from the title, this is not a particularly significant missing card, and I doubt anyone will ever care, but I have a Shards of Alara "Jund" insert describing the Devour keyword, with "The Best Way to See the Best Play" and an image of Chandra on the back (describing "Magic the Gathering Pro Tour"). This back is included on several other inserts in the Magic Album database, but not for the Shards "Jund" insert.

Again, it's not particularly significant, but I like organizing things, and so far (I'm about 95% through my collection), this is the only card I've found that appears to be missing from the database. So kudos on being very thorough and all that. :p

Attached are images of each side of the card, mostly just for clarification.