I used this deck for the ninth 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.
The Ringbearer has been captured. Orcs bearing a White Hand have ambushed the Fellowship and have captured not only Frodo, but Sam and Merry also. Spurred by desperation and regret, the remainder of the Broken Fellowship pursue the Uruk-hai west across the plains of Rohan, hoping against hope they can catch them before the hobbits, and The One Ring, are lost forever.
This deck is going to try and get as much questing power on the board as possible. The main strategy will be to flood the board with cheap allies, such as Snowbourn Scout and Naith Guide and use the Sword that was Broken to draw as much willpower out of them as possible. Protector of Lórien and Celebrían's Stone also help with the questing. Steward of Gondor and Ranger Provisions will boost our resources so we can afford these while Deep Knowledge will let us draw more of them. If needs be we can throw allies under any enemies that we need to chump-block. The heroes will soak up most of the archery damage, and the Warden of Healing will make sure we won’t be overwhelmed.
Thematically this deck represents the surviving members of the party ambushed on Amon Hen chasing down the Uruk-hai across the plains of Rohan. There are some Silvan allies to represent Celeborn’s party from Lothlorien and some Rohirim for the various scouts and outriders of the Mark. There are more attachments that allies however, because the heroes are still more dependant on their own skills than on the help of others in their quest.
The play-through using this deck can be found here: