Probably merely having played with them will nick a big chunk of the value; collectors are looking for perfect condition, mint cards. That said, I found https:

Probably merely having played with them will nick a big chunk of the value; collectors are looking for perfect condition, mint cards. That said, I found https://yugiohprices.com/ https://yugiohprices.com/ if you wanted to take a look; there are some super-valuable ones, but it sounds like they were extreme rarities for special events, and otherwise the top card is just $444.44.