The First and The Last

When this creature enters the battlefield, sacrifice all
Vampire creatures but this creature.
The First and The Last becomes a copy of every Vampire creature sacrificed this way. Target
opponent sacrifices X amount of creatures
where X is the amount of Vampire sacrificed this
way.
Indestructible.
The First and The Last's Power and Toughness are equal to the number of Vampires sacrificed when entering the battlefield.