Milling millipede

Enchant creature an opponent controls
Enchanted creature get +1/+1.
When enchanted creature leaves the battlefield, place Milling millipede on top of the enchanted creature controller's library face up, then they shuffle their library. Whenever the face up Milling millipede is added into your opponent's hand, they send the top five cards of their library to the graveyard, place Milling millipede face up on top of their library, and shuffle their library.