Every distinct wording since 2010, newest first.
August 7, 2026 · The Hobbit
If a battle that isn’t being attacked has no player designated as its protector, or its protector is a player who can’t be its protector, its controller chooses an appropriate player to be its protector. If no player can be chosen this way, the battle is put into its owner’s graveyard. This is a state-based action (see rule 704).
April 14, 2023 · March of the Machine
All currently existing battles have the subtype Siege. Sieges are subject to special rules.