The closest comparison I can think of is with Stroke of Genius, which might not have been played if you couldn't point it at your opponent, but both of these cards net the same CA per mana.
This looks amazing at X>5, and decent even below that. Sure, it doesn't have the incidental lifegain that Sphinx's Revelation had, but in exchange you get to dig one card deeper for the same cost. The discard is only a minor drawback, and plenty of decks can even spin it into an advantage. Overall this seems like an automatic inclusion in pretty much any Standard control deck.
4x Kefnet the Mindful
I feel like mono-blue might be in with a shot for standard?