Bitterblossom is a rare Kindred Enchantment — Faerie card from Morningtide (MOR), collector number 58. Current market price: $37.06 (foil $138.99), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you lose 1 life and create a 1/1 black Faerie Rogue creature token with flying.