Soul Starvation

Enchanted creature has Lifelink and "Whenever a creature an opponent own dies, put a +1/+1 counter on this creature."
If enchanted creature has 3 or more +1/+1 counters on it, return Soul Starvation to your hand.
Those Dark Eldar who for long didn't feed on pain, wilt and slowly fall into madness. They would go to any lengths just to end their hunger.