Commanding Taskmaster

{1}, {t}: Target creature you control gets -1/-1 until end of turn. Another target creature you control gets +2/+2 until end of turn.
Whenever a creature you control dies, you may
put a -1/-1 counter on target creature an opponent controls. If you do, put a -1/-1 counter on target creature you control.
"The strong will survive, yes. But, only because I allow it."