Saddest Singer

When Saddest Singer enters the battlefield, all other creatures get -0/-2 until Saddest Singer leaves the battlefield. If a creature's toughness goes under 1, it stays at 1 instead.
{3}{u}{b}, {t} — Tap all creatures your opponent controls. They don't untap on your opponent's next untap phase.
"The Saddest Singer brings tears of sorrow to all that just glance at her. Her songs are told to bring sadness to even the happiest of creatures."