Response: After a character leaves play, ready Prince Imrahil. (Limit once per round.)

But beyond, in the great fief of Belfalas, dwelt Prince Imrahil in his castle of Dol Amroth by the sea, and he was of high blood, and his fold also, tall men and proud with sea-grey eyes. –The Return of the King.

Each Outlands character you control gets +1 .

...foremost on the field rode the swan–knights of Dol Amroth with their Prince and his blue banner at their head. –The Return of the King

Combat Action: Spend 1 resource from Prince Imrahil's resource pool to search the top 5 cards of your deck for an ally who shares at least 1 Trait with him, and put that ally into play. Shuffle your deck. At the end of the phase, if that ally is still in play, shuffle it into your deck. (Limit once per round.)

Response: After Soldier of Dol Amroth enters play, reduce the cost of the next card you play this phase by 1.

...he and his knights still held themselves like lords in whom the race of Númenor ran true
–The Return of the King

Attach to Prince Imrahil.

Price Imrahil gains the Outlands trait.

While you control Outlands allies that belong to 4 different spheres, add 1 additional resource to Prince Imrahil's resource pool when you collect resources during the resource phase (if Prince Imrahil is a hero).

While there is a hero in your discard pile, Prince Imrahil loses the ally card type and gains the hero card type.

"We must gather all of the strength that we can find.
–The Return of the King