Nena

Creatures your opponents control with -1/-1
counters on them can't be equipped, enchanted,
or have +1/+1 counters put on them.
Empress — When Nena enters the battlefield put
a -1/-1 counter on target creature you don't control. At the beginning of your upkeep, put a -1/-1 counter
on target creature with a -1/-1 counter on it.