Death

Flying, Afterlife 2, Undying(If Death is put into the graveyard from the battlefield, if it had no +1, +1
counters on it, return it from the graveyard to the battlefield with a +1, +1 counter on it)
Death costs X less to cast where X is the number
of creatures in your graveyard.
Death has deathtouch as long as it has a +1, +1
counter on it.
{b}{x}{t}Return creature with converted mana cost
X to the battlefield.