Sultai Reanimator relies on big creatures like Overlord of the Balemurk and Bringer of the Last Gift along with impactful spells, so Duress is excellent at stripping key spells like Rapid Rescue before they can enable their plan. Requiting Hex's mana value 2 or less restriction whiffs on most of their real threats, so it comes out. Get Lost gives you unconditional removal for their bigger threats such as Superior Spider-Man or an impending Overlord of the Balemurk. Decorum Dissertation is too slow against a deck that can flood the board quickly, so it trims for the more proactive discard.