ygonwah is a Chrome extension developed by Joey Albano that provides valuable features for Yu-Gi-Oh players. It allows users to look up past Yu-Gi-Oh banlists and cards released up to a specific point in time, making it ideal for those who want to experience the game in the past or play under previous sets of rules. This tool enables users to see the available cards and the restricted cards for competitive play at any given historical moment.

Additionally, ygonwah offers a custom UI interface for Duelingbook.com, a popular website that allows players to enjoy Yu-Gi-Oh without physical cards. The extension enhances the user experience by integrating the user's selected forbidden card list from the Chrome extension into the website. When building a new deck of Yu-Gi-Oh cards on Duelingbook.com, users can easily identify and avoid cards that are part of their custom forbidden card list.

With ygonwah, players can set banlists up to 2020 and view the banned cards on DuelingBook.com's search results during deck building. Furthermore, the tool supports card releases up to 2021, allowing users to see unreleased cards in the search results. This feature provides players with up-to-date information and a seamless deck building experience.