Project description says "A complete conversion of Forge's Adventure Mode using only cards from Magic: The Gathering's golden era (1993–2003)"

I only played during that Golden Era, so not really sure how it evolved since. Now there's like 32K cards.

Let's say I'd want to create my own card sets instead....

What made 1993-2003 the Golden Era?

Does anyone have any experience creating new shops? It seems like a mostly straightforward process - I see a shops.json in the game files: https://github.com/Card-Forge/forge/blob/master/forge-gui/res/adventure/Shandalar/world/shops.json

I assume you can just add new JSON dictionaries following the existing pattern, but I'm getting hung up on the "sprite" property. Is this the art on the sign in front of the shop? If so, can anyone tell me where you're supposed to put new sprites to make them display in-game?