With so many ways to manipulate your deck introduced in the voyage to the sunken city, this deck became a bit more consistent and more fun to play.

If your deck is reordered with Lorekeeper Polkelt, playing Sir Finley, Sea Guide guarantees your OTK as your hand becomes full of cheap spells, even without Spawn of Shadows. Finley is flexible as he can also be used to simply redraw your hand to look for specific combo pieces or answers against aggro.

There's a similar Reno priest deck by Swizard featured on this site with a much better guide so I'll just list some cards I'm considering for myself.

Possible alternatives:
Pen Flinger / Bloodmage Thalnos
Shadow Word: Death / Penance
Psychic Scream / Shard of the Naaru