We could probably have found room for Gwen Stacy and Miles Morales in a non-Spider-Man specific set, but there wouldnt have been room for Aunt May. McCall says that designing for a Universes Beyond set flips the worldbuilding on its head, in that a typical Magic set needs its cards to lay the groundwork of its location and setting while also being fun to play with in order to get players on board, whereas most people already have some familiarity with a character like Spider-Man
For example, characters would fuse monsters with spells or directly summon traps from their hand
Typically, in a booster box of 24 packs you might get about 1 to 3 alternate art cards on average (this total includes alt-art Leaders, Rares, SRs, or SECs)
NOTE: The package has been opened to see which button is inside
Once its on the battlefield, it often changes the texture of an entire game, turning the card advantage that most decks look to create into a liability, no matter the plan of your opponents
Following the reveal of more details for the heavily anticipated Lord of the Rings: Tales of Middle-Earth set, the MTG community has been filled with chatter about all the new information regarding out of the most anticipated crossovers to ever come to Magic: the Gathering