When Coldsnap was released back in 2006, Wizards created some Coldsnap Theme Decks that you could get at GenCon. These decks had cards from Ice Age and Alliances in the modern borders. For example:

as opposed to

I don't believe they were official products that you could purchase, so they aren't listed in Gatherer, but it would be nice for Deckbox to recognize the "set". Star City Games has a definitive list of these cards, here:

http://sales.starcitygames.com/category.php?cat=5057&start=0