Steed of the Mark
The Morgul Vale#139 (x3)
Attachment
[1]
Mount.  

Attach to a Gondor or Rohan hero.

Response: after attached hero commits to a quest, spend 1 resource from attached hero's resource pool to ready attached hero.

...fresh horses were always in readiness to bear his errand–riders to Rohan in the Noth... –The Return of the King