Phantom Mossdog

Shadow, undying (This creature can't be
blocked except by other creatures with shadow,
and when it dies, if it had no +1/+1 counters on
it, return it to the battlefield under its owner's
control with a +1/+1 counter on it.)
{b/g}, Discard Phantom Mossdog: Each
opponent loses life equal to the number of
noncreature cards in your graveyard.