What it does
"Selfie Shot" isn't a real Magic: The Gathering keyword or ability—it doesn't exist in any official rules, set, or card. There's no mechanic by this name, so there's nothing legitimate to explain about how it functions in Commander or anywhere else.
It's possible you're thinking of an actual keyword that sounds similar, or you've encountered a joke card, a fan-made custom card, or a misremembered term. Real MTG keywords that might be confused include things like "Shroud," "Cipher," or activated abilities involving targeting yourself.
If you can share where you saw "Selfie Shot"—a specific card name, set, or screenshot—I can help identify what it actually is or point you to the correct mechanic. I'd rather give you accurate rules info than invent something that could mislead your gameplay.
Iconic cards with Selfie Shot
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