Arlen, Orzhov Father

{2}{w/b}: destroy target creature you control.
Grant Arlen Power and Toughness equal to
that of destroyed creature until end of turn.
Whenever Arlen attacks, pay {2}{w}, target
creature has to block Arlen until end of turn.
Whenever Arlen attacks, Pay {2}{b}, target
creature can't block Arlen until end of turn.