Hi sorry, first time posting, and I'm not sure how to get the formatting done like everyone else, but I got bored and tried making some 500 HP decks to various levels of success. I'd appreciate any feedback/optimisation/tuning, since I have no idea what I'm doing (both in terms of how to post on the forum, and in terms of deckbuilding)!

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Should be pretty self-explanatory: play Diamond Shield, and wait until deckout. Use Hand Drill to replenish deck. As needed, either use Precog to dig for Diamond Shield, or ideally use it to ensure Waiter bonus at the end. Play Dry Spell to get the Water Quanta for Purify, and if you're lucky, get enough kills for Murderer bonus. (Since the intent is to win by deckout, you don't need to play the creatures from Hand Drill - in fact, it's better if you don't since you get Creatureless bonus.)

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The idea is similar to the deck for Thetis, except we need a bit of Gravity for Gravity Shield. Key idea is to get a turn 1 Protected/immaterial Gravity Shield. Metamorphosis is used similarly to Septima Rhay's usage in
this deck, except switch first to Earth (for faster Stone Skin) then to Time (for Hand Drill). Gravity Shield doesn't seem to block weapons, so use Flying Weapon on Perses' Pulverizers. Hand Drill the Pulverizers, and play them to get Weapon Master and Equipped bonuses.
Swamp (edit: Version 1, Rareless)

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If you open with 2 Metamorphosis, cast one on yourself so that you're more likely to be able to drop a turn 2 Dream Catcher. Once Dream Catcher is out, Metamorphosis mark to Earth to fast charge Stonewall. Once you have 63 Earth quanta, Metamorphosis back to Aether, and start milling. Depending on game state (cards discarded by Swamp), it may be possible to Metamorphosis to Darkness later on so that you can play weapons/permanents (Shank of Void, Eclipse) for Equipped/Weapon Master/Grounds Keeper bonuses. If you do, be careful to not self-deckout due to lack of Aether quanta. Remember you can mill yourself for Waiter bonus.
Needs time to set up though - prone to losing if Swamp gets an early Eclipse/Shark.

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Stumbled upon
this idea from Septima Rhay/serprex using Dispersion + Metamorphosis to generate fast Earth Quanta to fast charge Stonewall. Much faster at generating Earth Quanta to deal with the early Eclipse/Shark than version 1, but requires 4 rares. Also weaker to Pest-heavy starts (has issues getting Dream Catchers out earlier, but faster Stonewall charging provides more breathing room).
After first Disp+Meta, charge Stonewall (mark = Earth), then Metamorphosis to Aether for Dream Catcher mill. As possible, switch to mark = Light to charge for another Dispersion, or mark = Darkness to generate quanta for Eclipse/Shank of Void for bonuses (Grounds Keeper, Weapon Master, Equipped). Holy Light + Dispersion at the end for Murderer bonus. Once you're set up behind a Dream Catcher + charged Stonewall, you're basically just playing solitaire at that point.

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I stumbled upon this concept from serprex (specifically the deck from Schwa
at this link), and fell in love with the idea. I tried doing a few tweaks to optimise it against some Demigods, specifically St. Invictus. Definitely needs optimisation, the least polished of these decks. Can fail if St. Invictus gets lucky with the random creatures via rewind (e.g. Shard of Focus, Lifesmith, Ironclad Blacksmith, Null Mantis). Not sure if it'd be a good idea to use Equalise to reduce the Life Quanta cost of shield/weapon (i.e. use both Earth & Life Quanta for equalised equipment), or if the concept is doomed from the start?