Prince Xizor

{1}: Target opponent gains control of target
Hunter you control until the beginning of your
next upkeep. Untap it. Until the beginning of
your next upkeep, it must attack if possible, it
can't attack you or a planeswalker you control,
and it gains shroud, vigilance, and "Whenever
this creature deals combat damage to a player,
put a +1/+1 counter on it and a bounty counter
on target creature that player controls". Activate
this ability only any time you could cast a sorcery.