Celestine Cave Witch
{3}{B}Creature — Human Warlock
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.")