It brings together solo play, multiplayer, deck selection, and drafting in one browser-based experience, with options for both current releases and preview builds.

Players can start a solo match against an AI opponent by choosing a format, deck, archetype, and difficulty. For multiplayer, they can host a room, join using a code, or reconnect to a game. Draft options include Quick Draft against AI, cube draft, and hosting a pod draft. The site also offers deck management and lets users load a game state.

phase.rs is in early alpha, so cards may not work correctly and some features are missing. Its latest preview build makes new cards and fixes available ahead of each release. Card images are fetched at runtime from Scryfall, while card data comes from MTGJSON. The project states that it is not affiliated with or endorsed by Wizards of the Coast and does not bundle copyrighted Wizards assets.