Shriveling Rot is a rare Instant card from Darksteel (DST), collector number 54. Current market price: $0.48 (foil $3.00), TCGplayer market prices via Scryfall.
Choose one — • Until end of turn, whenever a creature is dealt damage, destroy it. • Until end of turn, whenever a creature dies, that creature's controller loses life equal to its toughness. Entwine {2}{B} (Choose both if you pay the entwine cost.)