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If I have a Cassette in Bot Mode that is chosen as a defender but flip a Swerve does it fizzle the attack when the character flips to Cassette due to the Stealth on that side as long as another target is legal to attack? Or not, since it's already been chosen as the defender?

Once an attack is legally declared, the defender picking up Stealth wont matter.
Source: Wizards of the Coast (2019-11-09)    【Link to Ruling】
Tags: Swerve, Stealth