Armanus, Orzhov Life Bender

{1}{w}{b}: Armanus, Orzhov Life Bender gains deathtouch and lifelink until end of turn.
Whenever you gain life, if you gained 4 or more life this turn, exile Armanus, Orzhov Life Bender, then return him to the battlefield transformed under his owner's control.
"Be thankful. I have given your life new purpose." -Armanus, to the Gateless