The only visual difference between a 1st Edition card and a plain shadowless card is the "Edition 1" stamp on the lower left of the artwork
Already popping up in lists like KikiChord in Modern as a 2-of, there is every reason to believe that there may be a configuration in Standard that wants to run multiple copies into a trophy position
A: Technically yes, but doing so risks damage and devaluation
Subtle Strike and Skulduggery are generally better and cheaper, though Borrowed Malevolence has the upside of being a first-turn kill spell against a 1-toughness creature without needing another target in play
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For many of these - including Firesong and Sunspeaker - this ended up being quite true