here is a fun deck I recently put together. It basically is an attempt at a 3-hero secrecy deck. It starts with 21 threat, but between Elrond's Counsel and sneaky Gandalf, you should be able to hold below 20 threat for a couple of early rounds.
Apart from that the basic strategy is like this:
You hard-counter locations with cards like Northern Tracker and Asfaloth. You soft-counter enemies with Forest Snare and a general low threat. And you avoid Treacheries with Risk Some Light and Denethor.
Most of the other cards are "just" power cards to fuel me around these themes, but one raises above the masses and that is the Master of the Forge as he allows me to run plenty of attachments in a single copy. He is just sooo good. I guess cards like Sneak Attack don't need further explanation, but if you have any questions, feel free to ask.
P.S.: You can soon see the deck in action as I made a video of it (Currently uploading). I went completely mad and used this deck against Shadow and Flame without testing it against other quests whatsoever and without knowing most of the Shadow and Flame cards. Still had a blast