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How do tap abilities work?

You can use one tap ability during your turn, before you attack. It’s one of your turn actions,
just like playing an Action card, playing an Upgrade card, or flipping one of your characters to its
other mode. To use the tap ability, the character that has the ability must be untapped. Using
the ability causes the character to become tapped.
Source: Wizards of the Coast (2019-03-01)    【Link to Ruling】
Tags: Tap