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If Topspin has Bold 1 and Tough 1 and defends, what happens?

Topspin's own ability will add to any Tough total he already has. In that example, he'll have Tough 2 and flip 2 more battle cards.
Source: Wizards of the Coast (2020-05-09)    【Link to Ruling】
Tags: Topspin, Air & Space Assault