N'Zoth, The Corruptor

When N'Zoth enters the battlefield, you may
return a creature card from your graveyard to the battlefield. It gains When this creature dies, return
it to the battlefield tapped under its owner's control at
the beginning of the next end step.
When N'Zoth is put into a graveyard from
anywhere, its owner shuffles their graveyard into
their library.