Amulet of Vengeance

Amulet of Vengeance enters the battlefield
tapped.
{1}{t}: Place a -1/-1 counter on any creature.
You lose 1 life for each -1/-1 counter on targeted creature. Hexproof does not affect this ability.
{2}{t}: Place a +1/+1 on target creature. It gains
shroud. You lose 1 life for each +1/+1 counter
on that creature.