What it does
I'm not aware of "Feed" being an official Magic: The Gathering keyword or ability. It doesn't appear in the comprehensive rules or any released set as a standalone keyword mechanic.
You may be thinking of something similar-sounding or a custom/unofficial card. A few possibilities: "Devour" (a creature enters and you may sacrifice creatures to it, getting +1/+1 counters per creature eaten), "Exploit" (a creature enters and you may sacrifice a creature for an effect), or perhaps flavor text/ability names from specific cards that reference "feeding."
If you can tell me the exact card or set you saw "Feed" on, I can give you an accurate rules breakdown and explain how it plays in Commander. Otherwise, double-check the card's actual keyword—it's easy to mix up the many sacrifice-themed mechanics in Magic.
Iconic cards with Feed
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