Ecindrel, Ending Cinder

Flying, menace
When Ecindrel, Ending Cinder enters the battlefield, each player with seven or more creatures sacrifices half of his or her creatures rounded up. the same is true for lands, artifacts, enchantments and planeswalkers.
Only when his kingdom had fallen in flame, only when the blood of his knights covered the streets, only then would Ecindrel allow the king to die.