Twinning Staff is a rare Artifact card from New Capenna Commander (NCC), collector number 383. Current market price: $17.12, TCGplayer market prices via Scryfall.
If you would copy a spell one or more times, instead copy it that many times plus an additional time. You may choose new targets for the additional copy. {7}, {T}: Copy target instant or sorcery spell you control. You may choose new targets for the copy.