Pestilence

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

30th Anniversary Edition

The List

Battle Royale Box Set

At end of turn, if there are no creatures in play, sacrifice Pestilence.
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B Pestilence deals 1 damage to each creature and each player.

Classic Sixth Edition

Each activation is considered a new damage effect. An activation can only be 1 point of damage.

It will stay on the battlefield if there is a creature that is put into the graveyard during the end step. This is because this ability will not trigger at all if there is at least one creature on the battlefield as the end step begins.

Note that "until end of turn" effects wear off after "at the beginning of the end step" triggered abilities, so an artifact that animates until end of turn can keep this on the battlefield.