Conquer the World

When you cast this spell, return all creature
cards from all graveyards to the battlefield
under their owner's control.
Whenever a creature dies, its controller may
have each opponent lose 1 life.
{1}{b}{b}: Each player chooses a non-legendary
creature they control. You may have each player
sacrifice those creatures. Activate this ability only
as a sorcery and only once per turn.