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If Blurr attacks and deals damage thus triggering his effect, if the only untapped character(s) left have stealth, will Blurr not untap? Or will it still untap and just not attack again?

Blurr will untap and Blurr will attack one of the characters that has stealth.
Source: Wizards of the Coast (2019-07-29)    【Link to Ruling】
Tags: Blurr, Fastest Bot in the Galaxy