What it does
"Opus" isn't an official Magic: The Gathering keyword or ability. There's no rules text, reminder text, or card mechanic by that name in the game.
You may be thinking of something else—possibly a card name, set, or product. For example, there are cards with "Opus" in their titles, or you might be confusing it with a real mechanic. Common keywords people mix up include things like "Boast," "Foretell," or "Convoke."
If you can tell me the specific card or context where you saw "Opus," I can clarify what's actually going on. It's also worth double-checking the card's Oracle text on Gatherer or Scryfall, since those give the official, current wording for any ability—and will confirm there's no keyword called Opus.
Iconic cards with Opus
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