Here are a few cards I have that are not in the Database.

http://www.wowtcgvault.com/ViewCard.aspx?CardName=The%20Horseman%27s%20Horrific%20Helm&Edition=HO
http://en.wow.tcgmarket.eu/Winter_Veil_Disguise_Kit_%28Holiday_Promos%29.c3p252126.prod
http://www.wowtcgvault.com/ViewCard.aspx?CardName=Kwee%20Q.%20Peddlefeet&Edition=HO
http://www.wowtcgvault.com/ViewCard_Popup.aspx?CardName=Searing%20Scorchling&Edition=HO
http://www.wowtcgvault.com/ViewCard_Popup.aspx?CardName=Swift%20Brewfest%20Ram&Edition=HO

And 4 really coolc Biker promo cards that you will find here :
http://www.wowtcg.com/tournaments/draft-rally/2011-draft-rally

I have one copy of each. Last card I can think of (but I don't have it yet):
http://www.ccgcastle.com/items/view/4740/Krazal+the+Eggregator