Celestine Cave Witch
{3}{B}
Creature -- Human Warlock
2/3
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.")
It of the Horrid Swarm
{8}
Creature -- Eldrazi Insect
4/4
Emerge {6}{G} (You may cast ~this~ by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.)
When you cast ~this~, create two 1/1 green Insect creature tokens.