It Which Lurks in Dreams

Creatures you control have sleepwalk. (Those creatures can block while tapped. If they would die
during the turn they block this way, exile them
instead.)
Forgotten - {5}{u}{b}, Turn this card face-down: For
each face-up creature card you own in exile,
create a copy of that card except it's a blue and
black Nightmare Illusion. Activate this ability
only if this card is face-up in exile.