Moonlit Sharpshooter

{2}{u}: Tap target creature.
{b}, {t}: Moonlit Sharpshooter deals damage equal to its power to target tapped creature.
Whenever a creature an opponent controls dies, put a +1/+1 counter on Moonlit Sharpshooter.
"That payment's as good as gone. Get in my way, and you'll be good as gone, too."