Dorfen, Rhino of Abzan

{g/w}{b/g}{t}: Target creature you control deals damage equal to its toughness to target creature or player.
Whenever Dorfen, Rhino of Abzan attacks, put a +1/+1 counter on another target tapped creature you control.
When a creature an opponent controls is placed in a graveyard from the battlefield, each opponent loses 3 life and you gain 3 life.