Smoldering Tar 
Enchantment
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.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL