So I was thinking that maybe each element should have a purchasable theme deck from the bazaar that would be costed at right above market value (1,050 electrum with the decks ranging from 1,000-1,050 electrum in value)for the cards but also contain an alternate art card as a reason to buy it. Sure it would mean you'd need to purchase a bunch of extras of cards you'd never use but since seemingly the community loves tedious grindfests it wouldn't be an issue, and honestly alternate art is the best way to handle rare-ish things.
The theme decks could include a deck of cards with a bit of in built basic strategy, some deck building and playing tips (written by people in the community), and an alternate art card only attainable through purchasing the theme deck.
A sample deck list
4sa 4sa 4vc 4vc 4vc 4vc 4vc 4vc 4vd 4vd 4vd 4vh 4vh 4vh 4vm 5uk 5uk 5uk 5uk 5uk 5uk 5um 5um 5um 5up 5up 5up 5ut 5ut 5ut
As you can see there is a 1 of Fallen Elf, that 1 of would be the alternate art card. The deck's theme is clearly to control the field while putting on pressure with werewolves, and to also combo the demons with the Fallen Elf. It isn't super strong, but the strategy itself is viable with some tuning up. By having some advanced strategies it is a step in the right direction for new players. The deck would also come with some advice on how to turn the deck into something playable, and as you can see the deck has some quanta issues so it'd also be the perfect deck to include advice on fine tuning a quanta base with too which also would allow players to include advice about that. Hopefully this sort of outreach would help more players get more involved.
TLDR: Affordable theme decks with advanced strategies to help players learn more in depth things about the game while also having alternate art cards as incentive for more advanced players to purchase. Do it.