This is a power deck for true solo. The key combo is Beregond with The One Ring, which allows him to start with Inner Strength. That gives Beregond a starting defense of 5, plus the ability to cancel a shadow effect. If it turns out he doesn't need to cancel the effect, his ability negates the threat increase from using the One Ring. Arwen Undómiel can raise his defense to 6, and the Warden of Healing--combined with Elrond's healing buff--means that Beregond can handle anything the game can throw at him.
It's a Vilya deck, so obviously you want to get Vilya in your opening hand if at all possible. (MotK) Firyal is amazing for true solo, allowing you to control the encounter deck.
Because of The One Ring, you lose if threat reaches 45, so there's plenty of threat reduction. Also plenty of Spirit allies with high will-power (plus 2x Faramir), so you don't raise threat on questing. The ents are there for attack strength.
Piloting: early rounds are for questing with Firyal and cheap Spirit allies; engage enemies and let Beregond defend (multiple times if you get Unexpected Courage on him). Don't worry about taking out enemies until you've built up your board state with Vilya.
Miner of the Iron Hills is in the sideboard for quests with nasty condition attachments.