Battle of Asorath Plane

Exile all creature cards from all graveyards.
An opponent separates those cards into two
piles. Put all cards from the pile of your choice
onto the battlefield under your control. Then
put all cards from the remaining pile onto the
battlefield under target opponents control.
"The battle raged on for many years. In the end
everybody lost."
—Tome of Ancient Wars, Verse 2307