If you have Flying Pikachu VMAX and Espeon VMAX out in play, most Lost Zone Box decks have very limited (if any) outs to actually doing anything meaningful
"Look, I drafted Human control!" "Wow, UR Wizards can be really good when the right enablers show up." This is much more interesting than one guy drafted Elves, another Goblins, another Merfolk, and so on
Duskmourn introduced Kaito, Bane of Nightmares to the deck, as its -2 ability can tap down threats before turning into a hexproof creature that's incredibly hard to deal with.
It also featured the return of Shining Pokmon , complete with retro-inspired sparkle
Standing alongside it is the lesser-known Holy Day, whose only difference is being a white instant, and Darkness, which is the exact same effect but as a black instant