This deck is meant to be played cooperatively with multiple decks at the table. The whole idea is to mount everything possible thats in play and boost them with Elfhelm's ability. This is so you can come out on top in the end (pun intended lol).
By mounting up everyone you're thinking that you would be somewhat useless doing things for yourself, but you are far from it. Amarthiúl with a Armored Destrier will give you a solid 4,4 hero that can hold his own. It even gets better when Arwen Undómiel hits the table, allowing you a 5 sentinel defender for the whole table (man, he likes to get around)!
Your third hero can either be Glorfindel or Galadriel, depending on if someone else is using him. Putting Light of Valinor and his trusty steed Asfaloth make him a nice 4 and solid location control.
Not only are you going to mount everyone up (haha) but you are also going to make them multidimensional with song cards! Someone like Glorfindel with a mount and Song of Battle gives you 4 and 4 at your disposal. Not to mention the possible resource smoothing you can do for your table mates.
This deck is meant to start off slow, but come on strong mid game to have a strong finish (as who doesn't wanna finish strong).