What it does
I'm not aware of "Consume Anomaly" as an official Magic: The Gathering keyword or ability. It doesn't appear in the comprehensive rules or any set I can verify.
It's possible you're thinking of a similarly named mechanic, a card with "Consume" or "Anomaly" in its name, or something from a custom/unofficial set or another game entirely. For reference, Magic does have abilities like "Consume" wasn't a keyword either, though "Devour" and "Exploit" handle sacrifice-for-value effects.
If you can share the exact card name or where you encountered "Consume Anomaly," I can give you an accurate rundown of how it works, the common rules traps, and its Commander relevance. I'd rather flag uncertainty than invent rules that could cost you a game.
Iconic cards with Consume Anomaly
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