Whisperer in Darkness

Flying
When Whisperer in Darkness enters the battlefield, target opponent reveals their hand.
You choose a nonland card from among them
and exile it. If the exiled card was a creature,
create a token that's a copy of it, except it's a
nightmare in addition to its other types.
Vex — {1}{b}{b}, exile Whisperer in Darkness
from your graveyard.