Pyrohemia is a uncommon Enchantment card from Planar Chaos (PLC), collector number 119. Current market price: $13.48 (foil $66.66), TCGplayer market prices via Scryfall.
At the beginning of the end step, if no creatures are on the battlefield, sacrifice this enchantment. {R}: This enchantment deals 1 damage to each creature and each player.