Vampiric Instinct

Enchant target Vampire. It gains Menace.
Whenever another creature is killed by this
enchanted creature, put a Reborn counter
on this creature.
If there is at least one Reborn counter on
this creature when it is put into your graveyard,
return this creature from your graveyard to
the battlefield with that many +1/+1 counters
as there were Reborn counters attached.