AKA The rest of the Abandoned Deck.
This is something my husband and I joked about - he came up with the name- but it's a challenge where your deck is just the cards missing from Abandoned lol. It'd only be 12 cards, all faces, but could present an interesting and silly challenge. 🤣 IDK if a similar idea has been brought up, I've not seen it yet, so thought I'd throw it out there.