Contagion Clasp is a uncommon Artifact card from Fallout (PIP), collector number 757. Current market price: — (foil $5.91), 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.)