Last Laugh is a rare Enchantment card from Torment (TOR), collector number 68. Current market price: $9.99 (foil $40.25), TCGplayer market prices via Scryfall.
Whenever a permanent other than this enchantment is put into a graveyard from the battlefield, this enchantment deals 1 damage to each creature and each player. When no creatures are on the battlefield, sacrifice this enchantment.