What it does
I'm not familiar with "Rapacious Hunger" as an official Magic: The Gathering keyword or named ability. It's possible you're thinking of a specific card name, a flavor term, or something from a custom/unofficial set, rather than an evergreen or recognized mechanic.
If you can share the exact card text or where you encountered it, I can break down how it works, the common rules pitfalls, and its relevance in Commander. A few things that might be close: Devour (creatures enter sacrificing others to enter bigger, common on hungry/voracious creatures), Bloodthirst, or named abilities on specific creatures like hydras or Eldrazi.
Want to paste the full card text? I'll give you the accurate rundown rather than guessing and risk steering you wrong.
Iconic cards with Rapacious Hunger
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