Infectious Cocoon

Enchant creature
At the beginning of your upkeep, put a growth counter on Infectious Cocoon, then Infectious Cocoon deals damage to X damage to enchanted creature, where X is the number of growth counters on Infectious Cocoon.
When enchanted creature dies, create Xira's Offspring, a legendary 4/4 black, red, and green Insect creature token with flying, trample, and haste.