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Optimus Prime - Battlefield Legend is equipped with Power Punch, flips completely for his attack, and chooses Leap of Faith as his Action. The first card Leap of Faith reveals is W-5 Gyro Blaster. If OPBL attaches this, do I keep all the flips revealed from Power Punch? If so, does that mean my opponent now cannot flip more than 2 cards for their defense now that W-5 Gyro Blaster has been attached?

No, W-5 Gyro Blasters ability only triggers if its attached when the character attacks or defends.
Source: Wizards of the Coast (2019-11-09)    【Link to Ruling】
Tags: W-5 Gyro Blaster, Optimus Prime, Battlefield Legend, Optimus Prime, Battlefield Legend