every time i’ve seen Sublime Epiphany cast in a game, the caster won about 3 turns later. it’s a control finisher in disguise. such a great card.
i don’t run Cryptic because it’s 1UUU and i like my cards to be splashable as much as possible. EDIT: the reason for that is because i want decks in my cube to be XYz to XYZAB in terms of color distribution. if your environment is more geared towards the X/Xy/XYz range, Cryptic looks a whole lot better because it encourages U or Ux compared to UXy/UXYz/etc.
But yeah, from my experience playing with/against the card, Epiphany is easily the most powerful blue noncreature spell in pretty much any given non-Power environment.