Had a lot of thought about it, I think it deserves to be Banned. At a glance it might seem that you can check it with mons decently, but it is very important to note that this only applies to when you already know the set which if played carefully and not revealed can be very problematic. The amount of pressure it puts while you prep for it in the builder is way too much and hence I think it is very unhealthy. So I am voting BAN.