Snapcaster will stay, it's not like it's a game breaker like a lotus or moxes or anything like that, there are so many answers to Snapcaster same with delver, IMO I can see ponder getting banned again, Snapcaster just has too many ways to get around him, mana leak will get reprinted 1 more time maybe not in m13 but in a future set, I mean look how long counterspell was around, blue is based on control spells like counterspells and bounce spells, there will always be some sort of counter that will make people mad, but as far as Snapcaster I see no change for him