Transcendence is a rare Enchantment card from Torment (TOR), collector number 20. Current market price: $6.62 (foil $27.30), TCGplayer market prices via Scryfall.
You don't lose the game for having 0 or less life. When you have 20 or more life, you lose the game. Whenever you lose life, you gain 2 life for each 1 life you lost. (Damage dealt to you causes you to lose life.)