Celestine Cave Witch - Symbol (CMB1) from Mystery Booster Playtest Cards 2019, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Bonnie Gabriel
• Card Text:
  When CARDNAME enters the battlefield, create two 1/1 black Insect creature tokens.
  Whenever CARDNAME 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.”)