Kindred Judgment by paying its mana cost, choosing a creature type that no opponent controls a creature of, destroying all creatures not of the chosen type.
Cast
Biorhythm by paying its mana cost, causing each player's life total to become equal to the number of creatures they control.
Each player that controls no creatures loses the game due to having 0 life.
Notes
You will also lose the game if you control no creatures as
Biorhythm resolves, causing the game to end in a draw. You can avoid this by putting a creature onto the battlefield after step 1, by having an indestructible creature, or by controlling a creature that is of the type you name when casting
Kindred Judgment. Similarly, any opponent who controls an indestructible creature and/or creature of the named type (including a creature with changeling) will not have 0 life or lose the game.
Results
Draw the game.
Each opponent loses the game.
Metadata
In 0 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Powerful (Bracket 3+).