Heroes conspire to generate (hopefully) plenty of resources and engage lots of enemies. Arwen Undómiel allows for resource acceleration in whichever sphere she chooses, while Mablung's ability makes for a steady stream of boosted resources.
In order to deal with the defense of so many enemies, we include Defender of Rammas and Defender of Cair Andros , as well as Jubayr, but I think we need more defense-heavy characters. Other potential defenders include Warden of Annúminas and Háma (3 copies gives the potential for a lot of usefulness). Ranger of Cardolan combines with the engagement feature of the deck to get a lot of usefulness. We might be okay on defense!
With all of these engagements happening, it's a good idea to have a lot of attack power to keep them weak to manage any enemies that have the capacity to pierce our defenses. Fornost Bowman has an attack proportional to enemy engagements. Aragorn and Marksman of Lórien combine to heavily lower enemy defense when needed. A number of supporting characters provide attack help as well. Because so many attacks will be occurring, I've included Prince Imrahil to account for any accidentally slain heroes to keep the party going longer. As usual, I've opted for a diverse (at best "adaptable", at worst "unfocused") trove of attachments and events which I deemed useful, and edited the deck down until it was below 60 cards.
So overall, this is a highly combat-focused deck which works through resource acceleration and managing a ton of engagements. Its weaknesses are lack of healing for all the combat, and lack of threat control.