Mordor Warg
The Sands of Harad#64 (x2/x1)
(20) 2 2 2 2
When Revealed: Attach to an Orc enemy and return that enemy to the staging area. Limit 1 per enemy. (Counts as a Mount attachment with the text: "Attached enemy gets +2 , +2 , +2 and +2 hit points.

Forced: When attached enemy leaves play, add Mordor Warg to the staging area."