Bitter Bird

When Bitter Bird enters the battlefield, put a death counter on any number of creatures and lose X life, where X is the the number of counters you put on creatures.
{p/b}{p/b}{p/b}{t}: Put a death counter on target creature.
{p/b}{p/b}{p/b}{t}: Destroy target creature with a death counter on it.
Whenever a creature with a death counter on it dies, create token that is an exact copy of that creature except it is black and it is a zombie in addition to its other creature types.