Mahito, Distorted Killing

Eminence - At the beginning of combat on your turn, if Mahito is in the command zone or on the battlefield, at your upkeep, you may sacrifice a creature you control. If you do, each opponent sacrifices a creature they control.

Deathtouch, Menace

Whenever a creature you control is sacrificed, put a +1/+1 counter on target creature.