Nemasu, Rot Lich

Deathtouch
When Nemasu, Rot Lich enters the battlefield, search your library for a creature card, put it into your graveyard, then shuffle your library.
Whenever another creature enters the battlefield under your control, if it entered from a graveyard, you may pay {2}. If you do, create X 2/2 black Zombie creature tokens where X is that creature's power.