>>57385835these were printed while lost box was really meta, they probably didn't want to give the deck a free +1 to lost zone by discarding them.
if you've played expanded you'd know that you can just discard a bunch of prism cards (which go to the lost zone on discard like your point) and have 10 in the lost zone turn 2 consistency. possible to sableye lostmine turn 1 even if you're lucky