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Secret Actions say they scrap at the end of my opponent's turn. If I Brainstorm, Secret Action, Peace Through Tyranny, how long does the Secret Action stay out? Will it stay out for my second turn, until it is my opponent's turn, and then scrap at the end of their turn? Or do Secret Actions just scrap at the end of the following turn, so it would scrap at the end of my second turn?

It will stay out for your second turn and scrap at the end of your opponent's turn.
Source: Wizards of the Coast (2019-07-12)    【Link to Ruling】
Tags: Peace through Tyranny, Brainstorm, Secret Action