Cocoon

Enchant creature you control
Enchanted creature doesn't untap during your untap step if Cocoon has a pupa counter on it.
When Cocoon comes into play, tap enchanted creature and put three pupa counters on Cocoon.
At the beginning of your upkeep, remove a pupa counter from Cocoon. If you can't, sacrifice it and enchanted creature gets +1/+1 and gains flying. (This effect doesn't end at end of turn.)