Ghost Larva Nurse

Ghost Larva Nurse's power is equal to the
number of Spirits you control.
When Ghost Larva Nurse blocks, it gets
+1/+1 until end of turn for each other blocking Spirit.
Spirits you control can't attack or block alone.
Whenever a player mills one or more cards,
create a 1/1 black and white Spirit creature
token with flying and lifelink.