Treacherous Blessing is a rare Enchantment card from Theros Beyond Death Promos (PTHB), collector number 117p. Current market price: $0.46 (foil $1.25), 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.