Uruk Warg-rider
The Sands of Harad #63 (x2/x1)
Enemy
(40) 3 3 1 5
Orc.   Uruk.  

Uruk Warg-Rider gets +X while attacking a character with less than Uruk Warg-rider's X is the difference.

Shadow: Return attacking enemy to the staging area after this attack.