I've always loved playing both Traps and MonoLore decks. Argalad seems like a great addition to the strategy of passive enemy management. Here, I've used a lot of 1x unique, cheap allies to try to help provide some willpower, while the traps and healing are augmented by the draw and recursion in the deck.
I think you'll want to play with a deck that can throw some +ATT on Argalad, of course, and while I considered fiddling around with dropping some Tactics cards in off-sphere, I ultimately decided against that so we could get a few more traps going.
Over Hill Gandalf is amazing in MonoLore, if you haven't tried him, and Mirkwood Pioneer is actually sneaky great in solo. I might write up a longer article about this, but you know how your favorite podcasts are always asking for cards that help get you out of location lock once it sets in? Well, the Pioneer is here, everyone! In my play through of Black Riders, this guy helped me quest past Nazgul like it was his job (it WAS in fact his job) but he's a great way of eliminating high-threat stuff to help you get around it.
Ranger Bows are a bit just for fun, but I really like them. They work well on the Ithilien Trackers or Lookouts, and Damrod can carry one after he Wingfoots up.
Probably not the highest power level deck I've ever built but hey what can you do!