Hannibal, The Betrayer

When this creature enters the battlefield, each creature that you and your opponent's
control gain a bounty counter. For as long
as a creature has a bounty counter on it, it has:
"when this creature dies, you lose 1 life
and your opponents draw 1 card."
Whenever a creature with a bounty
counter on it dies, Hannibal The
Betrayer gains a +1/+1 counter.