Is it true that the set's Neo genesis, revalations, discovery and legendary collection are no longer modified? If so, why?
The sets that are allowed in Modified format are typically updated every year. Usually in September. It was delayed a month this year since there was a transition from WotC to P-USA. In the past, 3 to 4 sets have been removed from the format, usually in a block. That is pretty much what has been done here. An entire block of card sets, the Neo Block, has been removed, along with Legendary Collection. If WotC had still been producing the cards, we would have had LC2 by now to allow some of the older cards to stay in the format, but that set got cancelled, along with their self-created card set. Next year, expect to see the e-card sets (Expedition, Aquapolis, and Skyridge) removed from the format.