Koh, the face stealer

As an additional cost to cast this spell, exile target creature you control. Put a face counter on exiled creature.
Show emotion- whenever a creature attacks or blocks Koh, the face stealer, you may
pay {b}{b}, if you do exile attacking or blocking creature. Put a face counter on exiled creature.
{1}{b}{b}, Koh, the face stealer becomes a copy of target creature in exile with a face counter on it, except it’s a 6/6 black spirit shapeshifter.