If you have a lot of relevant permanents such that their Detention Spheres always have targets but yours might rarely have non Detention Sphere targets, you might need Banishing Light so that you can remove their Detention Spheres with a card that would otherwise be dead, having no other target than Detention Sphere
They may have deep bends, extensive scuffs, heavily damaged edges, pen or marker marks, minor water damage, or any defect that makes the card easily recognizable even inside a protective sleeve
Each contains five cards: a couple of thematic reprints, one or two renamed spells and - most interesting of all - a unique legendary creature depicting the character
Undercity is an awesome dungeon designed to be better for multiplayer than the original cycle of dungeons from Adventures in the Forgotten Realms
You can open those 73 cards from the Kamigawa: Neon Dynasty main set in non-foil and traditional foil
Then again, it also wouldnt surprise me if all of them are legit, and alignment differences like this are normal