Loot cards are special rare versions of WoW TCG cards found in booster packs, starter decks, and raid decks that have a revealable unique code. Once this protective layer concealing the code is scratched away, a 25 digit promotion code is revealed that can be entered into the Blizzard official promotions page. These codes work for both US and EU servers.
I have the 25 digit loot code, now what?
All accounts from every region in the world use http://www.worldofwarcraft.com/misc/promotion.html to redeem any and all special loot. This webpage allows you to enter the 25 digit promotion code and also select the region and realm for the character that will receive the loot item.
Upon successfully submitting the above information, you will be presented with an in-game code. Write this code down, print it out, or simply copy and paste it into the game; you will need it to retrieve your item. Log into the game with the character that is to receive the item and travel to Booty Bay in Stranglethorn Vale. There, you will need to find a goblin by the name of Landro Longshot. He is located on the lower parts of Booty Bay on the docks, and should be easily recognized due to the fact that he has a distinctive purple shirt and two bodyguards wearing Tabards of Flame next to him.
When you find Landro Longshot, he will first ask if you are here for a promotion, and then ask you which TCG expansion your item comes from (or Points Redemption); check your loot card if you are not sure which item that is. Ensure you have bag space to hold the item!