When Celestine Cave Witch enters the battlefield, 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 (Target a(n) player as you cast this. This card enters the battlefield attached to that player.) and "At the beginning of your upkeep, you lose 1 life.")