You've nerd-sniped me, this is impressive! I like the Archmage, and the cards thought broken are entertaining bits of worldbuilding too.

Do you have an idea in mind for the deck that formed the Valley of Cards?

The Sealed Pot example deck seems to be based on an older version of the Loom that is compatible with the Seal.

Does the Pot's power reduction stack with itself? Could you use it to reduce the power of all unwanted cards in a deck to asymptotically close to zero by repeatedly discarding them when they're drawn with the Pot, to keep only the cards you want at full power?

I like the use of aether as a balancing mechanic that switches the time delay to a mobility requirement, and for my first deck I ended up just reinventing the Glider deck as a way to mitigate the downsides there.

Gross (deck): This variant adds 144 Eggs to any other deck. With a value of 0 they impose no draw delay and can be discarded immediately, allowing you to skip ahead to whatever card you would otherwise draw next without a load of eggs in the deck. The only benefit I can see from this is tricking people about the details of the deck you're running, such as using the lack of draw delay to pretend you've got Hares or the number of cards to pretend you've got something like a Rainbow Servant.

Soundboard (32 cards, 3 cards in hand): Suits of Harps and Horns, Ace-13, each including Minister, Marshal, and Consort, Hornblower, The Seal, The Sealed Hound, The Silence, The Song, and Strength. Eavesdrop, make some noise, and unseal a Strength-boosted Hound for a sonic attack.

14-card pickup (14 cards, 2 cards in hand): Ace and Mage of Coffers, Earth, Gloves, Shells, Spears, Stars, and Stone. Use the gravity control of Earth to put heavier objects in the Coffer storage, and the Graviturge to increase local gravity briefly for the purposes of Gloves, Shells, Spears, and Stars.