Ulamog, Infinite Annihilator

This spell cannot be targeted.
When you cast Ulamog, exile each players' hands
and graveyards.
Indestructible
Infinite Annihilator (When this creature attacks, defending player sacrifices all permanents they
control.)
If Ulamog would be put into a graveyard or exile
from anywhere, shuffle Ulamog, your graveyard,
and your exile into your library instead.