Liquid Fire is a uncommon Sorcery card from Odyssey (ODY), collector number 201. Current market price: $0.14 (foil $0.70), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, choose a number between 0 and 5. Liquid Fire deals X damage to target creature and 5 minus X damage to that creature's controller, where X is the chosen number.