Pestilence, First Horseman

Menace, Infect
When Pestilence enters the battlefield or attacks,
it deals 1 damage to target creature.
At the beginning of each opponent's upkeep, that player may pay {1} for each creature they control
with a -1/-1 counter on it. For each time they
don't, they put a -1/-1 counter on another target creature they control.