Smoldering Tar is a uncommon Enchantment card from Invasion (INV), collector number 275. Current market price: $0.22 (foil $0.65), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, target player loses 1 life. Sacrifice this enchantment: It deals 4 damage to target creature. Activate only as a sorcery.