Haunted Windmill

When Haunted Windmill enters the battlefield,
create a {x} 1/1 black/white Spirit creature token
with flying.
{t}{x}{w/b}: Create a 1/1 black/white Spirit creature
token with flying.
{t}{x}{u/b}: Target player mills {x} cards from the
top of their library and puts them in their
graveyard.