Some random FAQ concerning this, copy/pasted from the net:
Where does it come from and how hard is it to get?
Path of Illidan comes from the World of Warcraft TCG (trading card game)
TCG Expansion: Hunt for Illidan (Press Release)
Card: The Footsteps of Illidan
Rarity: 1/11 booster packs (speculative)
Distribution: Hunt for Illidan booster boxes contain 24 boosters and cost approx $65 USD (inc. shipping), therefore the average cost of obtaining this particular loot is $30.00
How much would I expect to pay for one off eBay or similar?
According to
WoW TCG Loot: Path of Illidan(most information sourced from there), the expansion won't be released until the 1st of July 2008. Upperdeck Entertainment the makers of the TCG have specified that all three loot cards (The Footsteps of Illidan, Disco Inferno!, Ethereal Plunderer) are as common as those in the last set, so apart from the initial rush during release the price should for this item should average around less than $8USD.
Facts:
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Each card redeems for a stack of 50.
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Duration is 5minutes.
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Useable in feral / altered forms.
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Only dying removes the buff, zoning hearthing etc. does not break buff
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Useable at any level and therefore available for twinks.
How do the Loot cards work?
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 offical 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
WorldofWarcraft.com -> Promotion Retrieval Centerto 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 succcessfuly submitting the above information, you will be presented with an in-game code. Write this code down or print it out; 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 recognised due to the fact that he has a distinctive purple shirt and two body guards next to him.
When you find Landro, 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 got bag space to hold the item!
The thing on WoWhead:
Path of Illidan - Item - World of Warcraft