Bitterblossom is a mythic Kindred Enchantment — Faerie card from Secret Lair Drop (SLD), collector number 1898. Current market price: — (foil $49.24), 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.