Writhing Chrysalis is a common Creature — Eldrazi Drone card from The List (PLST), collector number MH3-208.
Devoid (This card has no color.) When you cast this spell, create two 0/1 colorless Eldrazi Spawn creature tokens with "Sacrifice this token: Add {C}." Reach Whenever you sacrifice another Eldrazi, put a +1/+1 counter on this creature.