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How do I use a Micromaster’s tap ability? Let's say Raider Detour. I tap Raider Detour, then scrap a card with a blue battle icon, and draw my 2 cards. Does that mean I have used Raider Detour and now I attack with one of my other characters?

You can still play an Action or Upgrade if you haven’t and would like to, but then you can move on. Each turn, you can use one tap ability. Raider Detour will not be able to attack because he is tapped. However if he were untapped somehow, he would still be able to attack.
Source: Wizards of the Coast (2019-07-29)    【Link to Ruling】
Tags: Tap