Trying to identify a few cards that I know are not the original printings.

Porten - modern frame, ice age symbol
Wings of Aesthir - modern frame, ice age symbol

Those cards are from a Coldsnap theme deck reprint. If you look closely, the set symbols from the newer versions are not exactly the same as Ice Age.

Portent is linked below:
http://sales.starcitygames.com/carddisplay.php?product=44155

Wings of Aesthir:
http://sales.starcitygames.com/carddisplay.php?product=44165

magiccards.info is also a good resource for seeing all the different versions of a card.

http://magiccards.info/cstd/en/15.html