Warlock Assistant is a free, unofficial Magic: The Gathering companion app designed to bring deckbuilding, collection management and match tools together. Available in a browser and across phones, tablets and computers, it works without an account; signing in is optional for syncing devices, playing online and sharing collections.

Players can search the card catalog by name, text or type, compare printings, check rulings and format legality, and view prices in euros or dollars from several markets. Deck tools support building or importing lists, show format restrictions, and provide insights such as mana curves, estimated value and cards already owned. The app also includes preconstructed deck lists for copying and comparison.

Collections can track each copy’s condition and finish, with estimated values and CSV or text import and export. At the table, players can track life, poison and commander damage in several game modes, including online games. On Android, card scanning recognizes cards on the device without uploading photos.