Everlasting Torment is a rare Enchantment card from Commander 2016 (C16), collector number 233. Current market price: $2.41, TCGplayer market prices via Scryfall.
Players can't gain life. Damage can't be prevented. All damage is dealt as though its source had wither. (A source with wither deals damage to creatures in the form of -1/-1 counters.)