Multiple player-controlling effects that affect the same player overwrite each other. The last one to be created is the one that works.
July 25, 2025 · Edge of Eternities
If there are any triggered abilities that triggered before this process began but haven’t been put onto the stack yet, those abilities cease to exist. They won’t be put onto the stack. This rule does not apply to abilities that trigger during this process (see rule 723.1f).
February 2, 2024 · Murders at Karlov Manor
rule 723.1a not present in this release
April 14, 2023 · March of the Machine
The starting player in the new game is the player who controlled the spell or ability that restarted the game.
November 18, 2022 · The Brothers’ War
rule 723.1a not present in this release
October 7, 2022 · Unfinity
The starting player in the new game is the player who controlled the spell or ability that restarted the game.
June 10, 2022 · Commander Legends: Battle for Baldur’s Gate
A “subgame” is a completely separate Magic game created by an effect. Essentially, it’s a game within a game. The “main game” is the game in which the spell or ability that created the subgame was cast or activated. The main game is temporarily discontinued while the subgame is in progress. It resumes when the subgame ends.