Death Cloud

Each player loses X life, discards X cards, sacrifices X creatures, then sacrifices X lands.
The Coalition fell silent as the cloud billowed up and out, blotting black the entirety of the Dominarian sky.
A rain of flesh followed as all airborne life was extinguished. Hearts froze and breaths caught; none could mistake the presence of Yawgmoth, Father of Machines, Linchpin of Phyrexia, Lord of Death.