The Sniper Decks
The idea behind these decks is to keep the enemy from getting an attack off on you. Keep them in the staging area, deal direct damage with Bilbo and Argalad, or attack them with Dunhere or Eomer. These decks are not strong against location heavy or low threat enemies.
Firefoot would be the next best attachment for Eomer, but any of the +2 attack boosts will work too.
Dúnhere needs the Spear of the Mark to be effective. Again, any +2 attachments work but I can't anticipate anyone wants to use more than 2 guarded cards, even with Bilbo's help in getting them. Get two spears on Dunhere? Trolls become no issue.
Hobbit Pony-- get them on the hobbits. Merry can be used for questing if no enemies pop (otherwise use him for threat reduction). Putting the other pony on Bilbo Baggins allows him to wait til the staging area is set to decide who has the highest threat and who wants to get thr damage. You will want at least one in your starting hand. No ponies? Hopefully you pulled the Westfold Horse-breeder to go get it.