Here is the deck:

1 Glorfindel
1 Boromir (tactics)
1 Théodred

Ally
3 Ethir Swordsman
1 Arwen Undómiel
3 Galadriel's Handmaiden
3 Squire of the Citadel
2 Errand-rider
1 Galadriel
1 Gandalf
1 Bilbo Baggins

Attachment
3 Blood of Númenor
3 Rivendell Blade
3 Gondorian Shield
3 Gondorian Fire
3 Steward of Gondor
3 Celebrían's Stone
3 Ancient Mathom
1 Miruvor
3 Light of Valinor

Event
3 A Test of Will
3 Elrond's Counsel
1 Lay of Nimrodel

3 Gondorian Discipline

I'm not sure about the new Galadriel ally, but after all in this deck there are 25 attachments.... Lay of Nimrodel in the end game is like 10+ quest power.

I used to play a similar deck. In my case I was playing Eowyn instead of Glorfindel. As soon as Boromir gets a Blood of Númenor, a Gondorian Fire, and it has 3-4 resources it seems like you are cheating. Are you using the Hobbit version of Gandalf or the core set one? In my deck I used the core one, and 3 sneak attack to have acces to more threat reduction. (And I used Galadhrim's greeting instead of Elrond's Counsel).

Any special reason to play BIlbo instead of , for example, west road traveller, which costs also 2 and have an interesting ability?

You put Gondorian Discipline into the wrong category. I'm also surprised to not see Light of Valinor. You must really hope to win quickly.

Light of Valinor was under "ally". West road traveller is an option, Galadhrim greeting is to hefty, in my opinion, for a single spirit hero. I'm a little bit tired of "sneak attack" and Gandalf....but it's definitely a powerful combination.

Here is a revised version:

Hero

1 Glorfindel (spirit)
1 Boromir (tactics)
1 Théodred

Ally

3 Ethir Swordsman
1 Arwen Undómiel
3 Galadriel's Handmaiden
3 Squire of the Citadel
2 Galadriel
3 Gandalf (Core)
1 Bilbo Baggins
1 West road traveller

Event
3 A Test of Will
3 Elrond's Counsel
1 Lay of Nimrodel
3 Sneak Attack

Attachment

3 Blood of Númenor
3 Rivendell Blade
3 Gondorian Shield
3 Gondorian Fire
3 Steward of Gondor
2 Celebrían's Stone
3 Ancient Mathom
3 Light of Valinor

Tracker posted a deck called "Boromir's Fire" a while back. He puts in Loragorn for threat reduction of Boromir I believe, but the basic idea is the same.