Underground Waifus is the first phygital trading card game (TCG), merging the physical and digital worlds, thus enabling players to experience the NFT and web3 universe. This unique TCG offers exclusive and limited-edition collections with over 400 unique cards in its first session, with future editions set to enhance the value of previous collections. Set in a post-apocalyptic cyberpunk future, the game features a circular economy that combines Free to Play (F2P) and Play & Earn (P&E) business models, and fosters competition through player vs player (PVP) battles with winnings for victors, tournaments, and ELO-based rewards.