So I am a mostly a solo player, though before now I have never played the saga quests solo. I generally use saga quests as a thing to do with friends for an afternoon. But recently I have decided to start a new campaign, solo, using (mostly) thematic decks. It's a tricky business, but it's going well; modern card pool really helps.
I use a different deck for every saga box. For The Black Riders, I have a Loragorn, Glorfindel and Arwen deck hereL http://ringsdb.com/decklist/view/3747/the-road-to-rivendell-1.0
For the Road Darkens, I have a Three Hunters deck with Core Aragorn and Legolas and Gimli from Sands of Harad.
http://ringsdb.com/decklist/view/3809/for-the-darkened-road-1.0
The second deck is still being tweaked; I escaped the Balrog but have one more quest to go for the Road Darkens.
I welcome all comments and suggestions, especially what hero combinations might work well for the next few boxes. I haven't played through any of them.