Before I move on and forget, and wanted to give a shoutout to some of the more interesting decks submitted (and their authors):
BGA_NICE99
— The singularity combo is really neat. A bit too luck-reliant and too easy to counter for a tournament setting, but must be fun to grind with.
BigDieck
— I'm glad I wasn't the only one who tried the great maul / dull khopesh combo! I'm sure that combo has a lot of potential, it's only a matter of finding the right shell for it.
— The gravity shield deck would have probably been more appealing as an earth/gravity duo, but kudos for thinking outside the box.
Hitei
— The chimera scythe combo is another really cool one, I think the deck needs fine-tuning but could be the next big thing.
Niharia
— The material bomb deck was my favourite to actually play, I regret only picking it once during the event. I might actually steal it and add it to my saved decks rotation, if you don't mind :-p.
Septima Rhay
— The mantis deck is neat, but strongly lacking in aether quanta. I often found myself needing 4-5 each turn, but only have 1-2 available. Just letting you know :-p.
Elemensch
— Since you have already requested help to improve your cardinal deck, my advice would be to 1) actually have something to do with your aether quanta, 2) either get rid of the scorpion-momentum combo or focus the deck on it, since the two halves of the deck (goose-wand & scorpion-momentum) don't synergize well together.
pimpollo
— Thank you for submitting an immorush, I love immorushes.
Well done not-Hitei for your victory :-)