Part of it is that they put counter doubling on [casthaven]Doubling Season[/casthaven], a card that fits itself into many different token strategies, particularly ones that involve planeswalkers
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
This Amethyst and Sapphire Legendary card rewrites standard deck-building limitations through its unique Gather the Party trait
Looking further into the main Duskmourn: House of Horrors set, we find a couple of easy additions
Here are some other cards I considered that didnt make it: Oath of Ghouls Null Rod Blood Moon Recurring Nightmare Cursed Scroll Phyrexian Processor Cabal Therapy Cabal Slaver A lof of these cards are interesting because they dodge Pyroblasts and because they handle the anti-red cards or Engineered Plague
