Azathoth, Blind Idiot

Defender, Reach
If Azathoth, Blind Idiot would leave the
battlefield you may put it in your library third
from the top instead.
At the beginning of your upkeep if 4 or more creatures have left the battlefield, cards have been exiled from graveyards, and/or cards have
been discarded since your last end step you may
search your library or graveyard for a Horror
creature and put it onto the battlefield tapped.