Severed Spirit

{u}: Put a +1 +1 counter on target creature your opponent controls.
If a creature your opponent controls has had 3
+1 +1 counters put on it this turn,
you may remove all counters from that creature
and have Severed Spirit haunt that creature
(When this creature attacks and is not blocked, it
deals damage to the haunted creature
as well as the player being attacked. One creature can
only haunt one other creature).