The reasoning behind this was that there were some players who disliked DFCs, a number of them being Wizards employees, and they were worried they'd be a colossal flop
Liliana's Standard Bearer
But rarity alone doesnt determine value
But, rather than slow down, Ravensburger is giving fans more of what they want with this expansion
You often want many creatures that mutate in the same deck to maximize the synergies, so Souvenir Snatcher doesnt go in just any deck
But the folks over at USPCC aren't stupid, and they realized that while it would be a smart move to protect their intellectual property, it would be a stupid move to shut magicians out from a product that they want and need, and to dry up a guaranteed source of steady income