Rule 415.1

Readying is an action that marks a non-spell Game Object on the board as available for action.

• 415.1.a To mark it, rotate the card 90 degrees opposite of Exhausting, so that it is vertically oriented in front of you.
• 415.1.b A Unit that is already Ready cannot be Readied again.
• 415.1.c If a Unit is instructed to be Readied while it is already Ready, nothing additional happens.

Official Core Rules