I have introduced this deck on the geek site. Here I would like to give my thoughts for including each card in it and ask about opinions of others, what would they do differently perhaps, which cards they would not choose to go with and/or which others might fit instead.
This deck is meant for coop. It fits well with a questing deck (using Rohan allies like Escort, Scout, or Finnest that leave play easily).
An easy choice for the Leadership representative here. Fits well thematicaly as well. His ability is supported by all allies in the deck.
Again, an easy thematic choice for the Tactics hero. May seem counter-productive with Dúnhere but the two tend to take care of enemies on both sides of the barricades.
Support the "Red Arrow" union.
Vassal of the Windlord
Easy combo with Support of the Eagles, Valiant Sacrifice, Horn of Gondor, Imrahil.
As the above, just this time it can help defending.
The extra hit. It is not easy to always make it work so he finished a wounded enemy but here (for the combo reasons above) it is sometimes beneficial when he leaves in process.
Descendant of Thorondor
A bit expensive. Good alternative for Sneak Attack when Gandalf is not around. More and more enemies tend to have no more than 2 hp, and if they have 3, the Spearman can finish the job.
Song of Battle
For Dúnhere, so he can play the Support.
For Dúnhere or Boromir. Or others like Legolas if he is around in the company of other players.
Horn of Gondor
There were games when (especially with three players, and it would be moreso with more) Horn made more money than Steward of Gondor. I still think Steward is universally more powerful but since the card is present with the other player, it is better to have Horn here as it fits all the leaving allies.
Support of the Eagles
Not easy to have this one out and going. Boromir can make a huge use of it right away, Dúnhere needs the Song first. When he does have it though, it can become a great fun to fell the Nazgul, trolls or gigantic spiders without engaging them.
Obvious for Dúnhere to make questing easier. Good for Boromir too, so he can attack an enemy for the second time.
As written above, no need to always wait for Gandalf, the Descendant can use this very well, either for questing to help Imrahil ready right away or to fight (can make Support more agressive when Vassal is not in play).
All allies leave easily.
Imrahil, Boromir, Spearman benefit some extra, Faramir or whoever has the Steward in the other deck as well.
A Light in the Dark
Can work as Feint, one can wait after the shadow card is revealed, and combos perfectly with Dúnhere.
The Galadhrim's Greeting
Not easy to play right away. Horn helps with this, and it is such better to always be attached to Dúnhere (together with the Song, if able). Helps both the Boromir and Dúnhere aspect of the deck.
Stand and Fight.
Not only you can "re-use" the allies, sometimes (with the Horn logic above) you can end up with more Spirit resources than Tactics ones.
There are some cards I have considered but did not find place for them. Westfold Horse-breaker is good to ready Dúnhere for another go against the staging area, and he readies Imrahil as well. Eagles of the Misty Mountains is a great ally, I feel, it just seems too expensive to fit here, I like cheap decks. Swift Strike could combo well with the Spearman or in general but I dislike the art. Stand Together is a similar thing, good card to have, did not fit.