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How does Brainstorm work, exactly? Do I play the two actions from my hand immediately, then resolve them, or do I resolve the first action before playing and resolving the second action? What if a character's trigger happens between actions, such as Wave 1 Thundercracker? Are triggers resolved before or after the action that triggers them?

You play one action from your hand, then you play the second, then resolve the triggers caused by those actions.
Source: Wizards of the Coast (2019-07-29)    【Link to Ruling】
Tags: Thundercracker, Mach Warrior