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Okay, so you've stated in the past that your opponent's characters count as "cards" when referring to Motormaster rulings. I was wondering, with regards to Spare Parts (which scraps itself instead of another Upgrade attached to your character) and Force Field, would a character attack count as a card causing Force Field to discard? In other words, if your opponent attacked an upgraded character with both a Spare Parts and a Force Field with enough damage to trigger the Force Field's effect, would you scrap the Force Field or the Spare Parts?

You would scrap Force Field because its ability is what causes it to be scrapped, not your opponents attack.
Source: Wizards of the Coast (2019-02-22)    【Link to Ruling】
Tags: Spare Parts