Vampire Castle

{p/b}{p/b}{p/b}: Attach to target land you control.
(It is guarded and you may redirect damage etc.)
Black creatures leaving the Vampire Castle
gain +2/+2 and lifelink until the end of turn.
Black creatures entered to Vampire Castle
or an attached place gain +2/+2 and have
"whenever this creature dies or kills, you
may create one blood token."
Enter {p/b}{p/b}