Nexus of the universe

Indestructible, this spell can't be countered
When Nexus of the universe is put into play, destroy all other creatures. Nexus of the universe's power is the combined power of all creatures in both players graveyards , and Nexus of the universe's power is based on the combined toughness of all creatures in both players graveyards.
{4}{b}: Take 3 creatures from either player's graveyard and put them under your control.
{4}{w}: Take 6 creatures your opponent controls and destroy them.
"The un