that's kinda what I was saying, it stops the first turn after it being played's draw
it stops hourglasses pretty much completely (unless you cna play some 'normal' cards)
and can be used to boost your shield (bonewall) or fill slots (photons etc) that can't damage you (if you have a -1 attack shield)
yer, forgot about fractal, shuts down fractal decks too (sorta) --maybe just slows them
but then again, the nightmared person doesn't have to play a single card as they can all be discarded....