If the target creature regenerates or has indestructible, each other creature controlled by that creatureâ€™s controller will still get -2/-0.
Public Execution targets only the creature it destroys. If that creature is an illegal target when Public Execution tries to resolve, it wonâ€™t resolve and none of its effects will happen. No creature will get -2/-0.
Only creatures controlled by the player when Public Execution resolves will get -2/-0. Creatures that enter the battlefield under that playerâ€™s control or that the player gains control of later in the turn are unaffected.
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