As many Guarded attachments this has a very good effect once you control it but it can be difficult to manage depending on which card ends up guarding it. Still a worthy inclusion in many decks since it's neutral and I think it partners up really well with Éomer.
Necklace of Girion
Attachment. Cost: 1.
Guarded (enemy or location).
Attach to a hero.
Attached hero gets +2 and collects an additional resource during the resource phase.
...the necklace of Girion, Lord of Dale, made of five hundred emeralds green as grass, which he gave for the arming of his eldest son…
The Wilds of Rhovanion #11. Neutral.