While it should be able to avoid accidentally leaking cards itself and can potentially punish leakers (especially the source of the leaks, who have likely signed an NDA) to try to keep others from following suit, all it takes is a single person from the massive supply chain who takes a Magic card from an idea in Mark Rosewater's brain to your kitchen tableR&D employees, printers, translators, distributors, vendors, tournament organizersto disregard their NDA and post something about what they have seen on the Internet for a leak to happen
Right now, Magic card collectors around the world are letting out a collective groan at the thought of all those cards, some of which sell for thousands of dollars today, being stuffed into a 6-year-olds backpack
Cards like Avacyn, Angel of Hope and Throne of Eldraine are too much to expect from such a cheap product, but there are many angel staples like Lyra Dawnbringer, Starnheim Aspirant, and Sephara, Sky's Blade that would be reasonable inclusions
Its the original appearance of Scute Swarm, which has been reprinted a few times but always soars in demand whenever a new lands commander is released