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If you play One Shall Stand, One Shall Fall from your opponent's scrap, and you choose to hit your character upgraded with Holomatter Projector, does Holomatter protect you from the damage from "your opponent's" card?

No. The card is effectively considered your card since you're the one playing it, even though your opponent is the one who owns it.
Source: Aequitas (2023-07-05)    【Link to Ruling】
Tags: Nightbird, Enigmatic Agent, Holomatter Projector