Sadistic Slash is a uncommon Instant card from Marvel Super Heroes Commander (MSC), collector number 666. Current market price: $0.26 (foil $0.52), TCGplayer market prices via Scryfall.
Target creature gets -5/-5 until end of turn. Mayhem {1}{B} (You may cast this card from your graveyard for {1}{B} if you discarded it this turn.)