Demon Hunter's Aspect
The Demon Hunter's Aspect loot card is from the War of the Ancients expansion set.
When used, this item disguises your character as a Demon Hunter for 5 minutes. When disguised as a Demon Hunter, your character will still display his/her weapons. There is a 30 minute cooldown on the item.
If your character is Horde, then you will be disguised as a Blood Elf Demon Hunter. If your character is Alliance, then you will take on the appearance of a Night Elf Demon Hunter. Demon Hunter disguises are also gender specific.
Characters can mount, take damage and attack while disguised as a Demon Hunter. This item is also usable in BGs.
This loot card is rare — found in only 1 out of 121 booster packs. War of the Ancients booster boxes sell for around $100 each, with each box containing 24 packs of cards. Based on the rarity of this card and the going price for a box, one could expect to spend around $500 trying to pull this loot card from a pack.
On ebay right now you can grab one of these for $20-$25!
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Demon Hunter's Aspect Video Demo
Fast-forward to 0:27 to see the Demon Hunter's Aspect disguise.