I used this deck for the sixth quest of my Saga Campaign. I am going to try and keep it as thematic as possible, stemming from the 'What If?' of 'What if Gandalf didn't escape from Orthanc in The Fellowship of the Ring?' Please note, I don't own all the cards, so am not able to make the most powerful thematic deck theoretically possible, but constrained by what I have, here is my best attempt.
After the company fled Weathertop with a gravely injured Frodo, they made their way across the Last Bridge where they met up with Gimli, who had left Bree ahead of them to draw away the Enemy's attention. The company tried to evade the Nazgul by journeying through the wilderness but on the final approach to the Ford their foes sprung an ambush, claiming the lives of Findol, their elven guide out of Mithlond, Dori, who had travelled with Bilbo from Rivendell to help Frodo in his quest, and the mysterious Galadhrim who had shadowed their path from the Shire, helping them whenever their need seemed the most dire. Despite these heavy losses, the Ringwraiths were swept away by the floodwaters of the Bruinen and Frodo escaped to Rivendell where he was healed by Elrond Halfelven. After recovering from his wound, Frodo resolved to continue his quest, and following a great council there at Rivendell, set out with eight companions to Mordor, where the last hope of Middle-earth lies in the destruction of the One Ring.
The Deck: This deck is going to try and take care of the combat side of the deck, though Fellowship of the Ring should help with questing as well. Rivendell Blade and Dwarrowdelf Axe are to boost both Glorfindel and Elladan and Gimli respectively. Ring Mail is to boost Frodo Baggins and Gimli. Ranger Spikes is for keeping enemies in the staging area where theirnthreat will be less of a danger, and also boosting Faramir's attack. Bofur should help dig out these weapons, and any Dagger of Westernesse that is found can really be put on anyone to boost their attack.
Thematically, this deck represents the Felloship setting out from Rivendell on their way to Mordor. The company is led by Aragorn, the long lost heir to the throne of Gondor, and is aided in this by the elf-lord Glorfindel who has faced the servants of the Enemy for countless centuries. For the dwarves, Gimli son of Gloin was sent, and Elrond's two sons Elladan and Elrohir for the elves. A stranger from Gondor also volunteered to go, as Faramir son of Denathor come to Imladris seeking answers raised by a dream about Isildur's Bane. And fron the Shire, Frodo's faithful servant Sam Gamgee and his cousin Merry were chosen, while Pippin, Tom Cotton and Fatty Bolger were sent home to warn their people of the dangers to come. Too old for any further adventures, Bilbo Baggins remained in Rivendell, but gifted his sword Sting to Frodo, as well as his treasures Mithril shirt. Thus, the Nine Walkers set out from Rivendell, though they did not do so alone, for the White Council sent out agents and scout to report on the movements of the Enemy and to aid the Fellowship however they could.
The play-through using this deck can be found here: https://theroadlotr.wordpress.com/the-saga/