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If Autobot Mirage attacks in bot mode and I draw 3 whites so he's untapped, does my turn end with the attack, or do I attack again as no one would be tapped? Also, if I must attack again can I use someone else to attack?

Mirage does not give you an extra attack. If your opponent has no untapped characters, you would continue attacking with all of your untapped characters in any order, including Mirage.
Source: Wizards of the Coast (2019-02-18)    【Link to Ruling】
Tags: Autobot Mirage, Lone Wolf