What it does
I'm not aware of "Cure" as an official Magic: The Gathering keyword or ability. It doesn't appear in the comprehensive rules or on any printed cards that I can verify.
You may be thinking of a few possibilities: you might mean a similarly-named mechanic like "Cycling," "Cumulative upkeep," or a flavor-named ability on a specific card. Alternatively, "cure" could be casual table-talk for removing a counter, curse, or negative effect, or it could be from a non-MTG game or a custom/homebrew card.
If you can tell me the exact card name or where you saw "Cure," I can give you an accurate rundown of what it does, the common rules pitfalls, and how it plays out in Commander. I'd rather not invent rules text and risk steering you wrong at the table.
Iconic cards with Cure
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