Bishop, Ruthless Enforcer

{b/r}{b/r}: If damage would be dealt to you or a
permanent you control this turn, you may prevent
that damage, and if you do, you may deal that
much damage to any target.
{b}{r},{t}, sacrifice a permanent: Deal 4 damage to
any target.
Revolt — At the beginning of each combat step,
if a permanent you controlled left the battlefield
this turn, you may pay {w}{w/b}{r/w}. If you do,
transform Bishop, Ruthless Enforcer.