Singularity Rupture by paying its mana cost, destroying all creatures and causing any number of opponents to mill a number of cards equal to half their library, rounded down, times two due to
Bruvac. You can also have yourself mill half your library, if desired.
Notes
If the targeted opponent(s) has an odd number of cards in their library, they will have one card remaining. If they have an even number, they will mill their entire library.