Hearthpwn

Mistermath's Card Ratings for Voyage to the Sunken City:

5/10

This card is interestingly fair, and even looks underpowered at first, as it is a Tracking that requires combo. The reason that it's not lower than a 5/10 is, of course, both the rogue spell synergy and the dredge synergy, especially with Azsharan Vessel. It's obviously a solid card in tempo rogue, so get ready to go fishin'!

While its not a secret passage or swindle, I still think this will fit the role of it considering your able to dredge an option from your deck instead of hoping for it, or getting unlucky and obtaining high cost cards you cant play. 

Cheap cycle, will see play.

HAH, caught one!

Sort of like Druid's version, but for 1.

druid's is conditional that you can play the dredged card, this is a guarantee with the combo.

Druid's is better when you are top-decking, Rogues is better for early game resource accumulation and specific combo piece digging

"druid's is conditional that you can play the dredged card, this is a guarantee with the combo."

Uh...this is conditional on the combo.  They're both conditional.