Wild Unraveling is a common Instant card from Lorwyn Eclipsed (ECL), collector number 84. Current market price: $0.14 (foil $0.25), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, blight 2 or pay {1}. (To blight 2, put two -1/-1 counters on a creature you control.) Counter target spell.