Hadun, Grand Mortician

{x}{b}{t}: Put X purge counters on target creature.
Hadun, Grand Mortician can't attack or block.
When Hadun, Grand Mortician enters the battlefield put a number of Purge counters on target creature equal to the number of creatures on the battlefield. When a creature with purge counters on it dies you may put X creatures from the battlefield into the graveyard where X is the number of Purge counters on that creature.