Lady of the Witching Hour

When Lady of the Witching Hour enters the battlefield, you may exile any number of creatures
from all graveyards. For each creature you exile,
put a black 1/1 zombie token into play under your
control.
If you do not exile any creatures, put a black 6/6
zombie titan token with trample into play under
your control.
When a zombie under your control dies, put
a +1/+1 counter on Lady of the Witching Hour.