Mana Weaver is a Generative Pre-training Transformer (GPT) designed to assist players and enthusiasts of the Magic: The Gathering (MTG) card game. Developed by Morito Sagara, it functions as a digital assistant to provide detailed information about MTG cards. Users interact with Mana Weaver by inputting the names of cards or URLs where specific card details can be found. In response, Mana Weaver sends back the requested card information. It is designed to answer various queries regarding card movements, card information in Japanese, and links to specific card sets. While these features enhance the card-playing experience, the Mana Weaver requires users to have ChatGPT Plus, implying the tool operates on top of the ChatGPT platform. Given the broad spectrum of MTG card information it offers, Mana Weaver can be highly useful to both new and experienced MTG players looking for an easy and accessible way to get comprehensive MTG card details.