My wife and I play for fun and we picked up the lords of winter expansion to expand a bit. But, before we do any deck building, can someone direct me to a place that has the deck lists for the core set so we can put them back together if we want? Thanks!

I don't know if there is a formal list anywhere. However, all of the Core Set cards have the letter S, L, B or T before the collector numbers at the lower right of the card's picture (or upper right of the text box). You can reassemble the Stark Core Set deck by putting all the S cards together, L for Lannister, etc.

All other AGoT cards have the letter "F" instead of an S, L, B or T, making the Core Set cards easy to distinguish.

Oh ok. That's very helpful. Thank you for the info.

All cards in the Core set are listed here (alphabetically, not by house): http://www.cardgamedb.com/index.php/GoTCards.html/_/core-set/

You can also find the contents of each deluxe expansion and chapter pack on the same website.