Shared Visions was a nice card for Nostrix combo. It turns
Cliffside Porter into an engine when you don't have access to Nostrix. As a result, all your answer cards are chosen carefully since they can receive Destiny. TTS hits anything, as does Harsh Rule, and Knife is able buffer your life total and clear out threats.
Since this deck is built around Porter, you want access to it through
Crownwatch Press-Gang.
Blind Storyteller is another hit off Press-Gang, but there might be better ones to go and find (like Crownwatch Patroller, for instance.)
Portent Reader gets the nod over
Second Sight, as its a unit you can exhaust with
Primal Etchings and
Shared Visions.