I really like Scouting Party. I've tried to build around it before, and while the concept was fun, in practice it faceplanted pretty hard. Most of the allies in the game with the Scout trait tend to be pretty expensive, and without resource generation, it's hard to pay for them. My initial dream of building up an army of Scouts that were questing for 20 by themselves, only to cast Scouting Party to make it 60 willpower fell by the wayside after several tests, and I haven't tried to the strategy since.
Legolas, however, introduced another Scout with a very strong ability to the mix, and I started thinking more along the lines of what a Scout is actually meant to represent. They don't come at you in the form of armies, but from the shadows. They gather information on the enemy, manipulate the terrain and situation to their advantage, and when necessary, strike from range to bring their foes down. With this in mind, I started thinking that a secrecy deck featuring the Scout trait might be the thing to try.
With the idea of controlling enemies, locations, and the encounter deck itself, along with a few Scouts and strong attachments to help us take off, this deck was born. Your main goal is to get Resourceful and Strider on Legolas, and Light of Valinor, Mirkwood Long-knife, and Unexpected Courage on Argalad. While Unexpected Courage is not necessary to make Argalad tick now that Legolas is in the deck, it gives you even more control over the deck, allowing you to potentially lower the threat of multiple enemies in the staging area, or ready him to attack from range. There are a few extra forms of readying in case you need a really strong round of threat removal or attack from Argalad, and each scout was added for the purpose of controlling locations as they appear out of the encounter deck. The rest of your events focus on manipulating the encounter deck or filling the holes where your heroes and allies can't get the job done.
While Peace, and Thought is the only draw in the deck, you could definitely find a place in your events for Daeron's Runes or Heed the Dream if you prefer more draw and less control of the encounter deck (Daeron's Runes is in another deck of mine at the moment so I did not include it). Resourceful is probably the most important card in your deck early on given the two hero setup, and I would probably mulligan for a combination of that and Strider or Light of Valinor.
Good luck scouting and controlling the enemy! Bring a combat deck with you to actually kill the enemies!