Treacherous Blessing is a rare Enchantment card from Theros Beyond Death (THB), collector number 316. Current market price: $0.37 (foil $0.65), TCGplayer market prices via Scryfall.
When this enchantment enters, draw three cards. Whenever you cast a spell, you lose 1 life. When this enchantment becomes the target of a spell or ability, sacrifice it.