Fleshraker Artisan

Venom (Whenever this creature blocks or becomes blocked, put a -1/-1 counter on each creature blocked by or blocking it)
{t}, Pay 2 life: Put a -1/-1 on target creature.
Remove 3 -1/-1 counters from any number
of creatures, sacrifice Fleshraker Artisan:
Seach your library for a card, and put that
card into your hand.