Rengar, the Pridestalker

Unseen Predator — Ninjitsu {3}{b}{r}
Whenever Rengar, the Pridestalker, deals combat damage to a player, put a hunt counter on target creature that player controls. Whenever a
creature with a hunt counter on it dies, put a
+1/+1 counter on Rengar and draw a card.
{1}{b}: Put a hunt counter on target creature an opponent controls.