Slaughter Specialist

Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature.

Whenever this creature or another creature dies, put a +1/+1 counter on each Vampire you control.

Enchant creature

Enchanted creature has lifelink and "Whenever a creature an opponent controls dies, put a +1/+1 counter on this creature." (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)

Whenever another Human creature dies, put a +1/+1 counter on this creature.

When this enchantment enters, create a 1/1 white Human Soldier creature token.

Whenever a creature you control dies, each opponent loses 1 life and you gain 1 life.

When this creature enters, create a 1/1 black Rat creature token with "This token can't block."

Whenever another creature you control dies, put a +1/+1 counter on this creature.