I don't play with this card much any more, but when The Black Riders first came out I used it frequently. It can be a game changer if circumstances are perfect, but it requires some careful planning and a little bit of luck. Imagine dropping an ally Beorn, Glorfindel, or Gildor for free!
I mostly play multiplayer now so I don't play this very much because it becomes difficult to make sure the Elf-Stone triggers during the correct players turn and that the player still has a high cost ally in his hand.
I like this card. It encourages traveling to a location by giving a strong benefit. You can actually attach more than one to a location if you are in a position to do so. An interesting combination to consider is adding Shadow of the Past to reuse tolerable locations.
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Nystrum
40
Sorry, only one can be attached due to card being unique.
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Nystrum
40