In my attempt to have a deck for every format on GEMP - I'm missing Hunters block, Multipath, and Second Edition - I finally got around to making a King Block deck. It just completed a 10-0 run in King Block league, and it's 13-1 in casual play. That said, I don't think it's a very good deck - it just plays the metagame well. 
What are the game-changing cards in King Block? 
Galadriel Lady Redeemed, of course. 
Cirdan crushes minions in the late game and works very well with 
GLR. Tale of 
the Great Ring is the best Frodo protection, since no event boosts Frodo without another exertion or having a sword. Thus, it was Elf time, and I had to build a shadow expecting over half Elf-event decks. That's what I've mostly seen, by the way. Here's the decklist, then card commentary.
Ring-bearer: 
Frodo, Hope of Free PeoplesRing: 
The One Ring, Such a Weight to CarryAdventure deck:
Rohirrim RoadKing's TentHall of the KingsOsgiliath FallenSteward's TombMinas Tirith Seventh CircleOsgiliath ChannelMorgul ValeHaunted PassFree Peoples Draw Deck:
1x 
Arwen, Fair Elf Maiden1x 
Celeborn, Lord of the Galadhrim3x 
Cirdan, The Shipwright3x 
Elrond, Venerable Lord1x 
Galadriel, Lady Redeemed1x 
Legolas, Fearless Marksman2x 
Asfaloth, Elven Steed4x 
Defiance4x 
Fleet-footed4x 
Still Needed4x 
Uncertain Paths1x 
Glimpse of Fate2x 
Shadow Between2x 
The Tale of the Great RingShadow Draw Deck:
2x 
Gorgoroth Agitator4x 
Gorgoroth Assassin2x 
Great Hill Troll4x 
Mordor Defender4x 
Mordor Fighter3x 
Mordor Trooper1x 
Orc Brood4x 
Orc Chaser4x 
Orc Pursuer(2)
1x 
Orc Stalker2x 
Grond, Hammer of the Underworld2x 
Flames WithinMy Fellowship is dull. Dishwater dull. The most interesting choice might be Frodo; I saw all three in league. It's hard to get the corruption burdens so I think 
Resolute Hobbit is too much. 
Wicked Masster! looks nice but is only good for 2 wounds, and doesn't work at the scariest sites 5 and 9. I think I've removed threats twice, but that's something. 
Legolas's discard-to-wound ability is more useful than I expected. I play 
Fair Elf Maiden because Arwen's job is to survive against big fierce minions until 
Cirdan arrives. I also play 3 Elrond and 3 
Cirdan because 
Cirdan is not useful early, while 8 base strength is more helpful than 7. The "last cards out" were 
Sting (Tale of 
the Great Ring works well enough, as Frodo's only getting a minion when I'm in big trouble) and 
Aegnor (another Elf body, but I found I didn't need another shield because nobody else played swarm). The "last cards in" were 
Glimpse of Fate and 
Asfaloth #2 - nice enough but not keys. There's almost certainly a better FP side out there. Maybe Aragorn could replace Celeborn. 
Gandalf Manager of Wizards isn't great because many Shadows want initiative.
Anything that relies on conditions or support area possessions would not work in the 
GLR meta, so that dropped many Shadow options. Yes, even Corsairs. 
Corsair Marauder is the key Corsair because he removes Fellowship support, but Elves have few possessions in block and 
GLR takes out most of the ships. I considered Nazgul plus Morgul Orcs, which I play in Movie and Expanded. Instead, I decided to go to an underplayed option on GEMP: Minion Swarm. As a former Rider, I sometimes played this type of deck to show new players how to be competitive without many rares. This deck isn't a low-rare deck, but the principles are the same. Fill the hand with minions then play them, preferably at site 5. I play 
Steward's Tomb for twilight even though it hurts my FP side.
Flames Within is usually a drop-and-play +2; people forget that it works with 
Great Hill Troll. The Initiative Trick with 
Mordor Fighter is just a bonus. Grond's biggest use is to put Assassin pressure on Galadriel, but it does help against the minority of non-GLR decks. I originally included 
Great Hill Troll as my only way to remove Tale of 
the Great Ring, but he turned out surprisingly good at site 2 and 3. I won a game off 11 twilight at site 3, enough for a Troll that killed 2 companions. 
Gorgoroth Agitator is another way to gain threats; it puts the opponent in a place where he can make mistakes. That's what I want. In league, I won 1 game solely because of opponent error, and in 2 more games opponent error made the victory easier. The single 
Orc Stalker is the "last card in", because a 5 cost tracker (counting roaming) is pricey. Looking back, I might drop it and 
Glimpse of Fate.
I won with my fellowship in 1 league game, with 9 Shadow kills. Casual play has about the same ratio. I bid 0 because I don't care about going first. Honestly, this deck is very beatable. I have no hand extension - just play 8 or 9 companions! Fortunately, the 9-companion deck was as rare as I expected, becuase of threats. It's tough to protect 9 people, and watching 8 threats go off is damaging. In a different meta I'd be 5-5, but here I went 10-0. And there you go.