Gildor is a very solid glue/splash hero - he is threat efficient for his stats, third lowest threat leadership hero, and brings a useful ability that is broadly applicable. He won't be one you build a deck around, but rarely will you find he isn't useful during the game.
I could probably leave the review there and have fairly accurately summed him up - that's what good glue heroes do, they just exist in a solid place and allow you to splash a different sphere without fundamentally changing the nature of your deck. Gildor is an excellent example of this idea in practice, so let's have a look at why.

His 3 for only 9 in Leadership means he's cheap to throw in but will contribute meaningfully to questing. For any deck that wants to splash in some key cards - say Steward or Armored Destrier or Faramir - he's an excellent choice to fill the questor role, especially given he's only 9 threat. There are only a handful of heroes that are less than 10 and also more than 2 , and only Sam exists in that space as a competitor in Leadership. Sam works best though when you build around him, or at least build to his strengths (low threat), where Gildor doesn't need anything else to feel like you're getting the most out of him.

Gildor's card draw ability also means you don't need to worry about having enough Leadership cards in the deck to maintain decent sphere balance - only put in what you want and if you don't have any you can or need to play that turn, draw a card to go find them. It's expensive long term if you plan around using it every turn and having Leadership cards you want to play consistently, but when used opportunistically it is useful to increase the number of cards to play with your other spheres.

The Noldor and Noble traits are also useful - Light of Valinor will drop right onto him and you can get some value out of his 2 , and you can maximise that with a Valiant Sword or the different Elven Weapons. He can have Steed of Imladris as well which synergises nicely with his card draw ability, enabling you to get rid of any extra uniques or cards you don't need at a particular point in time.
He also enables playing of the Noldor events Elrond's Counsel, Lembas, or Revealed in Wrath, all of which are powerful but aren't in sphere so may not get often thought of with him.

He doesn't have huge weaknesses -you really don't want him defending or taking archery damage as 1 and 3 ensures he's not doing it for long. The ongoing expense of the draw ability means if you're relying on paying for Leadership cards you also need to bring resource acceleration for him, or not using the draw as often. I found early I would rely on his draw and then not have resources to pay for things, and get myself into trouble, but changing the balance of spheres and/or having the free resource acceleration events helped that immensely.
He also precludes playing of his ally version which never impacted me but something to consider. Side note -

So where does he work best, and what might be useful to take with him?

Forth, The Three Hunters! is a good fit if you want to maximise his card draw - the natural reduction by the contract frees up resources to use his draw, and his draw helps find those restricted attachments to enable flipping the contract. Steed of Imladris and Celebrían's Stone are my go to attachments for him with the contract.

Tighten Our Belts has worked decently as well - it essentially replaces itself and gives you two additional resources on your other heroes. Legacy of Númenor works similarly though costs threat, but Gildor being Noldor enables Elrond's Counsel which can lessen the sting somewhat. Steward allows him to use his draw every turn, but I often found as the splash hero I'd rather have it on my other heroes to pay for the cards more crucial to the core idea of the deck. Errand-rider works well here to balance resources, but that's true of every multi-sphere setup, although it is in sphere for Gildor.

Arwen Undómiel is also a good partner for a quest focused deck - she discards cards for resources, he pays resources for cards. It isn't hard to churn through your deck with both in play, especially when you find the first Elven-light.

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There's really no drawback to it. If you're in secrecy, it's free and essentially gives you resources. If you're not in secrecy, it reduces your threat, hopefully back to secrecy! And either way it gives you a card. Simply put, this card is awesome. One coin (or nothing, in secrecy!) for 1 card and -2 threat in ? Thank you very much, ALeP!!!

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Not a bad weapon for Lore! If you have card draw (which you should if you are running any decent deck ;) ), then you can get definite use out of this baby. Reminds me of Protector of Lórien from the Core Set, except it's damage instead of attack boosts. So less effective against certain enemies (looking at you Uruk-Hai!), but also good against enemies with high shields, as long as they're not ITPCE. Also, the hero gains ranged, which is nice.

Can definitely see this in an Erestor deck, and maybe Beravor of Ori could get some use out of it. Not an over-powered weapon, but hey, if you want those, go play tactics!

My big problem with the design of this card is that it costs 2. Compared to Protector of Lorien, which only costs 1, it's less versatile and is more restricted in playability. This card would have been decent at cost of 1, and excellent at cost 0 (like the Elven Spear, for example). —

This game keeps surprising me with hidden subtleties. I like this card for its combination of mechanisms and flavour. It has an obvious pairing (hah) with Éomer, which seems fitting as he and Lothíriel got married. But there is an equally flavourful yet more subtle pairing between this card and both incarnations of her father, Prince Imrahil.

Prince Imrahil benefits directly from the synergy between his ability and his daughter's, him being able to ready as soon as the ally brought into play by his daughter leaves again. Then there's his incarnation, Prince Imrahil. His ability echoes that of his daughter, though only by playing an ally from the top 5 cards of your deck instead of your hand. In both instances, father and daughter share a connection. I think I know what kind of deck I'll make for my daughter when she's a bit older.

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Rules question: Could you use Without My Hat to search for The One Ring (i.e., is "Immune to non-Master card effects" active even outside play)?

Other than that, there are some broken combos I can foresee with this; Three Golden Hairs, Phial of Galadriel, and several of the other boons are attachments, as is Banner of Elendil (you can play it with A Good Harvest).

In terms of non-broken uses, the main one I can think of is waiting to play this until you see what you need most. Need readying? Fetch Unexpected Courage. Need ? Fetch a Weapon. Need to brag that you bought the Revised Core Set? Fetch Valor. To me, though, 2 resources, even neutral ones, seems like a lot, leaving me thinking that, unless I plan to target something broken, I'll mostly go without Without My Hat.

I'm not sure if "attachments" include boons. However, in my understanding, yes, you can fetch the One Ring. However, you have no possibly way to play it, because it's immune to non-Master card effects (so no Vilya shenanigans), and it has no cost so it cannot be bought. —
If you want the One Ring, probably should just include it in your deck ;-) —
if it work with the one ring , you avoid the setup-flaw of the reduced threadelemination, no small feat. —
You're right about the One Ring, Turgon; thanks for the advice. Regarding the boons, technically speaking their card type is "attachment," so they should be valid targets for Without My Hat. —
While you're on the topic of cheating in the One Ring, would Burglars Turn be able to do it? I'm working on a prototype now but don't want to be wasting me time lol —
Remember that "your collection" by ALeP definition includes boons only when you are playing in quests where you have earned them. —
I actually didn't know that, Alonewolf. Thanks for the correction, and thank you, ALeP, for thinking ahead! —