The Ghostface Killer

Bloodthirst 2 (If an opponent was dealt damage this
turn, this creature enters the battlefield with two
+1/+1 counters on it.)
When The Ghostface Killer is destroyed, if it had
a +1/+1 counter on it, tap this creature instead
and it becomes a 2/1 creature with "{b}, {t}:
Target player loses 1 life or sacrifices one
creature they control."