Guests, no account required
Anyone can play. Regulars can build a real history.

Not everyone at the table wants to sign up for an app to track their life total for one game. Manatable doesn't require it: anyone can join a table as a guest with no account by entering a name and starting to play. They can convert to a full account afterwards if they want their history to stick around.
For a one-off player
For a friend visiting for one game, joining as a guest is the whole onboarding flow: enter a name, join with the room code, and play. There is no signup wall between wanting to play Commander and doing it.

Permaguests: real stats without an account
In a regular playgroup, that same friend might show up every week without ever making an account. The host can keep a guest as a tracked "permaguest" between games. Permaguests accumulate stats just like a full member, and are managed from table settings (promote, demote, or remove; names stay unique per table).

What guests see vs. members
Guest devices see a "sign up to unlock" prompt on the stats board, while full members see game history, the leaderboard, and rankings. It nudges guests toward signing up without blocking anyone from playing.
Guests use the rest of Manatable the same way members do. See real-time tracking for how a guest's device stays synced like a member's, and stats and history for what permaguest stats track.