I don't actually think U&Y is particularly unfriendly to non-iap anymore. It was somewhat true before but with how the game has changed it isn't really true anymore. I think it would be more fair to call them beginner unfriendly. Difference being that U&Y has a viable sub pool 2-3 times bigger than Awoken Horus. Non-iap shouldn't mean you don't get any REM cards, there are enough free stones given out that you can still roll a decent amount, it just means you shouldn't count on getting specific REM cards. U&Y can use so many different subs well.