Season 5 cards were added as I did the episodes. Cards for Seasons 1–4 are being added in order. I'm currently on Season 1.
I use scanned images of my own cards if I have them, or found online if I don't. For cards that aren't real, or that are only in the video games, I use the image from the US series. If the image on the US card is different from the Japanese card, I will also include the Japanese image. I will list cards that only appear in a player's hand, or monsters that are set in defense and destroyed before they're summoned, if I can identify them.
Thanks to The Yu-Gi-Oh! Wikia, Edo's Yu-Gi-Oh! Page, Yugioh-Haus, Pojo's Yu-Gi-Oh! Site, Yu-Gi-Oh-Cards.net, Ideal Collectibles, various eBay auctions, and all the people who have emailed me with card info!
Note: When Yugi and Yami Yugi are occupying the same body together, I'm listing "Yugi" as the card user, no matter which of them is in control at the time. When the two are separated, I'm listing Yami Yugi as "Pharaoh." Yugi, of course, remains "Yugi."