Nero,Shepherd of the Lost

When Nero,Shepherd of the Lost enters the battlefield, put a hex counter on target creature an opponent controls.
Whenever a creature with a hex counter dies, gain 1 life and create a 1/1 black Bird creature token with lifelink.
At the beginning of your endstep,if a creature with a hex counter died this turn, put a hex counter on target creature you don't control
{b}{b}{w}{t}:Creatures you control have shroud until the end of turn.