Your enthusiasm is [exhausting] at least helpful in this scenario. I doubt there are any here if I haven't found them yet; I find them hard to miss. A brown back with a black void shape in the middle, and colorful monster, trap, and monster cards usually backed by gold, purple, or teal respectively.

Naoki made a suggestion that I might spend time recreating cards here in the art room. At the very least, if the search turns up nothing, I could teach people the most basic rules with base examples.