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My group has found conflicting answers in regard to Steamroll’s damage carryover being considered "combat damage" or not. FAQ on the app states that it is Attack Damage. Yet, Roundup 2/28/19 states that Motormaster would protect against Steamroll (making it non-attack damage) and Roundup 2/22/19 specifically states that Steamroll is NOT attack damage.

It’s possible you might be looking at an older iteration of the FAQ. There were conflicting answers earlier in the set’s life, but Steamroll’s damage carryover is not considered attack damage.
Source: Wizards of the Coast (2019-04-01)    【Link to Ruling】
Tags: Motormaster, Stunticon Leader