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My opponent just went and used Peace Through Tyranny and KOd his Lionizer...putting it on Spinister. Pteraxadon was already tapped. He then attacked with Spinister and KOd my Scamper. My Metroplex is still untapped. My opponent has another turn from the PTT. How does that work seeing hes all tapped out, but I still have a character thats untapped?

Your opponent still takes their extra turn, even if they wont be able to attack during that turn. Theyll still draw a card and can play cards, etc.
Source: Wizards of the Coast (2019-11-22)    【Link to Ruling】
Tags: Peace through Tyranny