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If Dreadwing - Sky Destroyer has 2 Spinner Rims attached and flips a white trigger on attacking, does he flip 1 extra battle card for each Spinner Rims attached, or just 1 extra?

Both copies of Spinner Rims will trigger and allow you to flip an extra Battle Card, for a total of two, in this scenario.
Source: Wizards of the Coast (2019-09-20)    【Link to Ruling】
Tags: Spinner Rims