I just built a web tool to help validate Magic: The Gathering decklists in custom formats. It automatically fetches card data from Scryfall, checks for banned or illegal cards, and gives instant feedback in your browser.

You can try it here: https://git.disroot.org/hirrolot19/mtg-legality-checker

I hope it’s useful for deckbuilders and casual players alike. I’d love to hear your thoughts, ideas, or suggestions for improving it!

Thanks in advance for checking it out.