Rika, Queen of Curses

Decimate—When Rika, Queen of Curses enters the battlefield, each opponent sacrifices a tenth of the creatures they control, rounded up.

You may sacrifice a creature and expel 1 cursed energy, put a +1/+1 counter on Rika, Queen of
Curses.

"I was happier spending time with you as a curse than when I was alive"