Contagion Clasp is a special Artifact card from Time Spiral Remastered (TSR), collector number 391. Current market price: $0.85 (foil $6.88), TCGplayer market prices via Scryfall.
When this artifact enters, put a -1/-1 counter on target creature. {4}, {T}: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)