Hold the Big Bang

Creatures your opponents control lose
indestructible and can't have or gain indestructible
until end of turn. Your opponents can't gain life
this turn. Damage can't be prevented this turn.
Deal X damage to each opponent and each
permanent your opponents control, where X is the
number of permanents on the battlefield, then exile
Hold the Big Bang.
This spell can't be copied or cast from exile.