Rule 104.4 · Ending the Game
There are several ways for the game to be a draw.
Subrules
If all the players remaining in a game lose simultaneously, the game is a draw.
If a game that’s not using the limited range of influence option (including a two-player game) somehow enters a “loop” of mandatory actions, repeating a sequence of events with no way to stop, the game is a draw. Loops that contain an optional action don’t result in a draw.
An effect may state that the game is a draw.
In a multiplayer game between teams, the game is a draw if all remaining teams lose simultaneously.
In a multiplayer game using the limited range of influence option, the effect of a spell or ability that states that the game is a draw causes the game to be a draw for that spell or ability’s controller and all players within their range of influence. Only those players leave the game; the game continues for all other players.
In a multiplayer game using the limited range of influence option, if the game somehow enters a “loop” of mandatory actions, repeating a sequence of events with no way to stop, the game is a draw for each player who controls an object that’s involved in that loop, as well as for each player within the range of influence of any of those players. Only those players leave the game; the game continues for all other players.
In a multiplayer game between teams, the game is a draw for a team if the game is a draw for all remaining players on that team.
In the Emperor variant, the game is a draw for a team if the game is a draw for its emperor. (See rule 809.5.)