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What happens if my opponent’s card tries to move damage counters onto one of my other characters?

Motormaster’s ability won’t affect any card that tries to move damage counters from one character to another. That doesn’t count as dealing damage. (The damage was already dealt. It’s just moving.)
Source: Wizards of the Coast (2019-03-01)    【Link to Ruling】
Tags: Motormaster, Stunticon Leader