Behemoth, the First

Indestructible, Vigilance, Menace
Damage isn't removed from creatures your
opponents control during cleanup steps.

Instant Death Aura - Exile any creature that blocks
or becomes blocked by Behemoth.

{t}{x}: Behemoth deals {x} damage divided among
any number of permanents. If a creature would die
this way, exile it instead. Sacrifice Behemoth.