This deck is designed with newer players in mind, and is part of a series of decks that can be contructed using cards from only the Revised Core Set and one other purchase: Angmar Awakened Hero Expansion.
This deck has a mid-range cost curve, with about a fifth of its deck costing 3 or more. In a tri-sphere deck this can be a problem, but Beravor should be able to help us draw Heir of Valandil. This card should be mulliganed for as it will transform the resource economy of your deck once you get a couple of enemies engaged with you. Speaking of which, Berevor ought to have a copy of Unexpected Courage on her so that you can be sure of drawing three of your cards each and every turn.
This deck can struggle in the opening few rounds while you get your engine up and running. Amarthiúl can defend the first enemy until you get out an ally to start helping cover attacks, preferably a Guardian of Arnor, though a Weather Hills Watchman will do as well. An early game Forest Snare will go a long way to keeping your deck consistent going forwards. Ranger of Cardolan and Feint can act as stop-gap measures to release pressure for a turn if you are close to getting a Guardian of Arnor or if you need to kill an enemy to take the foot off the accelerator but your action economy is struggling. Ideally you will have as many enemies engaged with you as you have Guardians of Arnor, plus a few extra for Forest Snare. Once you are able to consistently keep two or three enemies engaged with you safely, the deck truly starts to sing.
First of all, Heir of Valandil reduces the cost of allies by the number of engaged enemies. Those Northern Trackers and Warden of Annúminas suddenly aren’t so expensive, and now questing is taken care of. and you can realistically get Fornost Bowman or Sarn Ford Sentry in for free, the latter of which will draw you more cards concurrent with how many enemies you have engaged with you. Expert Trackers lets you pick off locations while Ranger Summons allows you to seed the encounter deck with Ranger of the North. You only pay one resource for them, they have decent stats across the board, and have an ability that triggers when they enter play. The catch is you have no idea when they will show up, if at all.
For more decks that can be built with only the Revised Core Set and one additional purchase, check out this article on Vision of the Palantir here: https://visionofthepalantir.com/2023/01/13/ten-decks-for-new-players/
Is Celebrían's Stone the only way you've got to play those 8x Spirit cards in the deck?