Well, since it seems like "Cyber Dragon Core" was being reprogrammed during this update, I'll post how it is bugged now (it still is, but some things are different):
1. First effect still optional.
2. First effect doesn't allow to add "Cyberdark Impact!", "Cyber Shield", "Cyber Summon Blaster", and "Cyber Shadow Gardna".
3. Second effect allows to Summon only "Cyber Dragon Drei" and "Cyber Dragon Core".