Dirty bombs inspire me

At the beginning of the end step, if no creatures are on the battlefield, sacrifice this enchantment. : This enchantment deals 1 damage to each creature and each player.

Players can't gain life. Damage can't be prevented. All damage is dealt as though its source had wither. (A source with wither deals damage to creatures in the form of -1/-1 counters.)

You can't get poison counters. Creatures you control can't have -1/-1 counters put on them. Creatures your opponents control lose infect.