First things first, this isn't as powerful as any version that includes Gondorian Fire/Blood of Numenor, with Seastan's Boromir deck being the preeminent example. When I built this deck, it was with the intention of leaving those cards out. They are super powerful, and I use them to take down Nightmare quests, for example, but often I find myself unsatisfied afterwards because they are so strong.
So this is a Boromir/Galadriel/Glorfindel deck that takes a slightly different approach, relying on Gondorian Shield and Captain of Gondor to boost Boromir's defense, with Song of Wisdom/A Burning Brand a crucial piece to avoid shadows. The goal is to hold off the encounter deck until you can get the Ents going, who can provide extra attack power in the back half of a quest.
While this deck won't beat every quest the majority of the time, it is my go-to deck and the one I name drop most often on The Grey Company podcast episodes, as it gives you a fighting chance against pretty much anything you face.
If you want to follow the deck's evolution, it was built as part of an in-depth article series on testing and refining decks:
https://talesfromthecards.wordpress.com/2015/01/12/deck-building-101-part-15-testing-a-deck-in-practice-1/
https://talesfromthecards.wordpress.com/2015/01/28/deck-building-101-part-15-testing-a-deck-in-practice-2/