The Murderer

Flying, Deathtouch, Shroud.
Disguise {7} (You may cast this card face down
for {3} as a 2/2 creature with ward {2}.
Turn it face up any time for its disguise cost.)
When The Murderer takes damage, you may
have opponent take control of it.
When The Murderer leaves the Battlefield, its
controller looses half of their life, rounded up.