Lumi, Susurration Flutist

Pacification (Whenever a creature enters the battlefield under an opponent's control, put a +1/+1 counter on it.)
Attacking creatures your opponents control that have +1/+1 counters on them get -3/-0.
Remove a +1/+1 counter from a creature an opponent controls: You gain 3 life. Activate this ability only once each turn.