After about 16 hours of testing and designing, I believe we have the best possible decks.
Decks that have been tested against all possible opponent decks and have a win ratio of at least 75% include:
Amilir, Sir Valimont, 10men, Nyma.
Decks that have been tested against all possible opponent decks and always win except with a specific opponent deck where they are at worst 50-50 include:
Vagman13, Kurohami.
Kurohami's only risk is that Rastafla takes a flying Stars deck, which Light could create from its salvage. He beats any Nova-Graboid deck with ease. We might still switch his deck with 10men at the last minute; however 10men's deck also beats RoL-Hope which only xdude (10men's opponent) can play because of upgrades. We doubt he will play it twice in a row but it's better safe than sorry.
Vagman's risk is inherent in the way UW's decks are rainbows and therefore always very subject to draws. We found his deck would win most of the time but here and there with bad draws or lucky draws for UW it would fail. It is the only deck that has a better-than-50% chance to beat both of UW's decks. Anything else we tried -- even the ones with Black Hole or Life-Entropy which in design should work -- had bad success rates against one deck or the other.
Zeru's deck has not been tested but the build is designed to kill Air. It looks very reliable but testing will be done today.
For the decks versus Fire: The Bone Wall Poison deck will beat anything Fire plays except the deck Lava Golem played last round -- which they are likely to use against us. The question is against whom. My guess is Lava Golem plays it again. The other deck is a Gravybow on Time. The Purify kills the deck Lava Golem played last time, and the Reverse Times in a good draw actually crush Immo-Rush. It's all about the draw. For a last-ditch anti-Fire deck not wanting to just sacrifice, it's actually very good ... and if Lava Golem uses his same deck from last time like we expect, it will win.
Note: It might seem crazy but if you look at Fire's remaining cards, while they still have great PC with Deflagration, they actually have very limited CC. Like 4 cards between 4 decks.