Casimir the First

Elder (Whenever this creature deals damage to another creature, put a bite counter on that creature.
It becomes a Vampire in addition to its other types.)
Casimir the First has indestructible as long
as there are X or more Vampires on the battlefield, where X is Casimir's power.
Whenever a creature an opponent controls
dies, put a +1/+1 counter on Casimir.