Former T2 deck in need of Extendifying

[Rooser]

Here's a deck that WAS T2 legal before Invasion Block rotated out:

Land
Underground River x4
Swamp x8
Island x8

Creatures
Cephalid Broker x4
Mesmeric Fiend x4
Sage Owl x4

Spells
Megrim x4
Urza's Guilt x4
Ensnaring Bridge x4
Duress x4
Recoil x4
Cabal Therapy x4
Careful Study x4

Soon enough even more of this deck will be Extended and not T2, so my question to you guys is, how do I update the deck for Extended play?

 

[train]

Throw in a haunting echoes or 2, and then put in some Diabolic edicts...

As for the Sage owl - Future sight might run your deck better - since most things are so cheap...

I'd also run a Grindstone...