I suggest Jace Beleren as the replacement for Ophidian's slot.  You draw immediately upon its resolution, it can play around enemy creatures (by not using combat to dig for cards and by growing itself out of reach of smaller enemy creatures' attacks), and it's the same converted mana cost.  It's everything a blue mage could possibly want for their Bullshit Permission deck.  Hey, it's not like you're dealing actual damage with Ophidian anyways, right?

Also, why do people hate Back to Basics right now?  It shuts off Bazaar, duals, manlands, Workshops, and Rainbow lands.  How many decks out there are going to run more than one or two basics to be fetched early?  Even if your opponent uses his fetch to find a Tropic and casts a Tarmogoyf, you can just counter it and that Tropic is now essentially useless.  If I was to play this deck right now, I would throw in Back to Basics and probably Null Rod to shut my opponent's mana off.  Then I'm sitting around with 2-3 counterspells in hand and the mana to use them, and my oppnonent is trying to dig his way out of the prison.

VS Ichorid I recommend Propaganda and Echoing Truth, though boarding 1 Trinisphere against them is also very strong because they'll spend a year getting to 3 mana and then you just counter their bounce spell.

What about focusing on Academy for this deck?  That's where Time Spiral was originally broken to bits, wasn't it?  Turn one wins where you draw a new hand and untap your academy?  Obviously the downside here is the restriction of Academy and the restriction of Crop Rotation, but would it be very hard to build around a shell of 1xAcademy+1xCrop Rotation+4x Tolaria West?  Or how about throwing the academy in the board with 4x Living Wish and 1x Mystical Tutor+4xPersonal Tutor to dig up the second turn Wish+Academy+tap for tons of mana+Timespiral-win.

What I know is this: Unrestricted Time Spiral and unrestricted Chrome Mox looks like it's made to rebreak Academy even as a 1-of.  There's enough free/cheap artifact mana to abuse it to death.