This is a fairly straightforward Rohan deck, with some support from defender all-star Beregond, as well as the Lady Evenstar and a small contingent of ents. It also has the honor of being the first deck that I managed to beat all nine quests of Voice of Isengard and the Ringmaker cycle with in progression mode (where I allowed myself all cards published as of the end of the cycle) !
If you wish to try and replicate that feat, be warned though that Three Trials and the Nîn-in-Eilph are extremely challenging and while this deck did beat them after around 5-7 tries each, it was very close. If you want something reliable, better look for a good Vilya / Outlands deck or something.
For Three Trials, that scenario alone motivated the inclusion of Beregond and if you have more than one core set, I encourage you to add in more copies of Unexpected Courage for him. Also, I think the Test of Endurance should be done last, because then you can travel to Hallowed Circle right away (since you advanced during the questing phase).
Nîn-in-Eilph is a bit more doable, but you need to really speed through the quest cards fast and you might have to sacrifice a hero in the end. Power of Orthanc comes in here, replacing Hasty Stroke, so we can deal with In Need of Rest. You can do the same for Dunland Trap for the same reason, though I didn't feel the need as much - I felt it shows up way more frequently here due to the small encounter deck size.