What it does
I don't have reliable information about a Magic: The Gathering keyword or ability called "Flesh Flayer." This doesn't match any official keyword or keyword action I can confirm exists in the game.
It's possible you're thinking of a specific card name, a custom/unofficial card, or a mechanic from a different game. There are cards with "Flayer" in their names (like Flayer of the Hatebound), but no standard ability by this term.
If you can share where you encountered "Flesh Flayer"—a card name, set, or text—I can help clarify what it actually does. I'd rather tell you I'm not sure than invent rules that could mislead your gameplay or deckbuilding decisions.
Iconic cards with Flesh Flayer
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