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Please post any questions about the game in here.

To tap a creature or tap the card you use is to turn it sideways so it's horizontal. This means the card has taken an action or used an ability.

examples: Combat

whenever a creature attacks you must "Tap" it. this means your giving it an order and it's now following through, however they can only do one action a turn.

That might sound confusing so the example I always use is this

"You just told a fat guy to go fight a hydra, now he's tired and needs to rest."

so yeah once something is tapped it remains tapped until the next turn or until an ability says otherwise.

Also the Tap symbol looks like a swerving arrow (see Emma's card-second ability)