What it does
"Flesh Hooks" isn't an official Magic: The Gathering keyword or ability—it doesn't appear in the comprehensive rules or on any printed card. You may be thinking of a different mechanic or a card name I should help identify.
There are similarly-themed cards and abilities worth noting: "Fleshtaker" is a creature with a sacrifice-payoff ability, and various cards reference "Flesh" in their names (like Lord of the Pit effects or Phyrexian themes). There's also no keyword resembling "hooks" in current Magic.
If you can tell me the exact card name or where you saw "Flesh Hooks," I can explain what it actually does and how it functions in Commander. It's possible it's a custom card, a misremembered name, or text from a non-Magic game—happy to clarify once we pin it down.
Iconic cards with Flesh Hooks
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