Roheryn
The Return of the King #12 (x3)
Attachement
[2]

Attach to a Dúnedain hero.

If the attached hero is Aragorn, he gains a Tactics icon.

Response: After you optionally engage an enemy, exhaust Roheryn and attached hero to declare attached hero as an attacker (and resolve its attack

"Aragorn's own horse that they had brought from the North; Roheryn was his name."

-The Return of the King