Roheryn
The Flame of the West#12 (x3)
Attachment
[2]
Mount.  
Attach to a Dúnedain hero.

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

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

"Aragorn's own horse that they had brought from the North; Roheryn was his name."
-The Return of the King