Whisper of the Dross is a common Instant card from Phyrexia: All Will Be One (ONE), collector number 117. Current market price: $0.34 (foil $0.62), TCGplayer market prices via Scryfall.
Target creature gets -1/-1 until end of turn. Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)