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If I have 3 characters and one of them is Motormaster in alt mode. My opponent plays a Steamroll and does more than enough damage to KO one of my other two characters. Do I have to put the extra damage on Motormaster or can I put it on my third character? If I put it on my third character does Motormaster's ability cause that damage to be lost or does the Steamroll effect supersede Motormaster's ability?

You can choose the third character and Motormaster will protect it. No extra damage is done.
Source: Wizards of the Coast (2019-02-28)    【Link to Ruling】
Tags: Motormaster, Stunticon Leader