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Say I attack with a Ranged character that has a Sturdy Javelin and some combination of other upgrades that produce the Overwhelming Advantage combination. I play OA, attack with the character, then scrap the Sturdy Javelin to do 2 damage to someone. Do I then lose the ability to trigger OA?

Yes. The upgrade check is made when flipping battle cards, so if you no longer have all colors among your Upgrades, OA cannot be fired.
Source: Aequitas (2023-07-05)    【Link to Ruling】
Tags: Overwhelming Advantage