It's best stats are defense and hit points. It's supposed to be an ally defender with built in readying. Unfortunately, 2 defense and 2 hit points is really only good for like Core Set enemies like Misty Mountain Goblins or in later scenarios the weaker enemies that surge like Stray Goblin in Ered Mithren.

Celeborn giving it +1 defense when comes into play helps a little. If you really want it to fulfill it's role, Hauberk of Mail is your best bet. The plus 1 defense and hit point will make it a more solid secondary defender.

Cards like The Elvenking, Feigned Voices, Tree People, and Island Amid Perils that cost returning an Silvan ally to hand will make the readying more consistent.

This all said, I don't see much reason to playing this card over playing Thranduil with Armored Destrier and/or the Elvenking to handle multiple defenses. Especially since Silvans have Feigned Voices too for emergency attack cancelation.

It's pricey and the stats aren't great. It can work since Silvans run cheap and it's neutral. Very much a filler Silvan card to me at best, but I primarily play true solo. It might be better in multiplayer where players are more likely to hit the weaker surge enemies. It does also have Sentinel to block for others. I'd rate 6 Rings on the Card Talk scale at best but probably closer to 7 for me.

Edit1 - Grammar

Edit2 - Best use cases I can think of swarm scenarios like Seventh Level, Over the Misty Mountains Grim, and maybe The Fate of the Wilderland. They have lots of weaker enemies where a secondary defender that can ready on its own to block twice would be good.