Celestine Cave Witch is a rare Creature — Human Warlock card from Mystery Booster Playtest Cards 2021 (CMB2), collector number 37. Current market price: $0.38, TCGplayer market prices via Scryfall.
When Celestine Cave Witch enters, create two 1/1 black Insect creature tokens. Whenever Celestine Cave Witch attacks, you may sacrifice an Insect. When you do, curse defending player. (Create a black Aura Curse enchantment token that's attached to that player. It has enchant player and "At the beginning of your upkeep, you lose 1 life.")