Eye of the Legion
The Eye of the Legion loot card rewards players with a pet that looks like a smaller version of the Warlock's Eye of Kilrogg spell.
Eye of the Legion Video Preview
The Eye of the Legion loot card is found in booster packs from the War of the Ancients expansion set.
War of the Ancients booster boxes sell for just under $100 each and contain 24 booster packs. This loot card is very common, but even at 1 in 11 packs, you could wind up spending $40-$50 trying to get lucky pulling it from a pack.
Average ebay price for the Eye of the Legion loot card: between $5 - $6. That's just slightly more than the cost of a booster pack.