How are you gonna do against anything with Den Protector + Dromoka's Command combo?

3 more Jace?

Why not play a couple Den Protector? You have a fair amount of instants and sorceries that can generate value if played again. Think of Languish and Treasure Cruise coming back. It also gets a decent body that faster decks have problems blocking. Anyway, awesome deck! +1

One thing you might try is taking out the Kothophed, Soul Hoarder for a few Clever Impersonator. It is less mana intensive than Kothoped as you are already running a lot of blue, and can come out two turns earlier. Plus it is also incredibly versatile, it can be a Rhino, a Hangarback, an Ulamog, or even another Tutelage. A one of Dragonlord's Prerogative might be nice as well.I wouldn't even run the Taigam's Scheming or Dig Through Time. Neither of them say draw cards on them. And four Treasure Cruise is a must.