Gúthwinë
The Mountain of Fire#11 (x3)
Attachment
[2]
Item.   Weapon.  

Attach to a Rohan hero.

Response: After attached hero is declared as an attacker, exhaust Gúthwinë to give that hero +2 for this attack. If this attack destroys an enemy, return a Rohan ally from your discard pile to your hand.

"Gúthwinë!" cried Éomer. "Gúthwinë for the Mark!"
-The Two Towers