Task Mage Assembly is a rare Enchantment card from Prophecy (PCY), collector number 105. Current market price: $0.21 (foil $3.00), TCGplayer market prices via Scryfall.
When there are no creatures on the battlefield, sacrifice this enchantment. {2}: This enchantment deals 1 damage to target creature. Any player may activate this ability but only as a sorcery.