I have 2 untapped cars and a Wave 2 Bumblebee tapped in bot mode. I play Ready for Action untapping him. I then flip him, triggering his mode ability and I play All-Out Attack allowing all my character to attack this turn as they are now all untapped prior me playing All-Out Attack (AOA). I put Anticipation Engine on one of my characters. I then attack with Bee first (tapping him), my 2nd character (tapping him), and finally the last character with Anticipation Engine (AE) which then taps him. AE triggers and I get Start Your Engines (SYE). I untap that last character with AE. Seeing how AOA was played during a time where all my characters were untapped, does that last character get to attack again since it was untapped with SYE post AOA being played?

If the opponent has no untapped characters, you will attack again with the last character. If the opponent has at least one untapped character, you cannot attack again with the last character. All Out Attack allows one attack with each of your untapped characters at the time you play it.

Source: Wizards of the Coast (2019-09-20)    【Link to Ruling】

Tags: All-Out Attack, All-Out Attack, All-Out Attack