Groaning Banshee

Protection from blue. Shadow.
Other Specters you control get +1 /+1 & shadow.
Groaning Banshee's power and toughness are
equal to the number of specters you control.
Death Wail--{b}{w}{x},{t}: All non-specter
creatures get -X /-X, until end of turn. Create
one 1/0 black & white specter creature token
for each creature destroyed this way.