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When defending I reveal the secret action Bolster. I then proceed to play Multi-Mission Gear to play Brainstorm, in turn playing Battlefield Report and Defensive Formation. As these 2 have the same trigger condition as Bolster, am I able to reveal them now that Bolster has finished resolving?

In this scenario, it is too late to reveal them.
Source: Wizards of the Coast (2019-08-09)    【Link to Ruling】
Tags: Bolster, Multi-Mission Gear