Saetha of the Deep

When Saetha of the Deep enters the battlefield
or deals damage to a player, each player sacrifices
half their creatures round up. Put a +1/+1
counter on Saetha of the Deep for each creature
sacrified this way.
When Saetha of the Deep is put into a graveyard
from anywhere, its owner shuffles their graveyard
into their library.
From the deep, silence to all life.