This deck is not reliable, unless you're looking to have fun and a different game each time you queue up for the next game. The win rate goes up and down, but very much possible to climb with(personally from Rank 23 - 6 so far). That said, play it on your own risk.
The version you see before you is the one I personally play. HOWEVER, don't feel the need to run a 100% copy of it. A lot of the cards are still under "experimental" stage.
It'll help a lot of if you have some Rogue Class experience to run this deck early stage -- same same but different.
Cards I would NOT recommend to craft, if you're playing to run this version, unless you open them in a pack are:
Sherazin, Corpse Flower (been preforming better than expected and has some fun synergy interactions, though to early to say).
Obsidian Shard (I'm just not sure if a weapon like this is needed, good second candidate to replace with something else of your own thoughts if anything, Sap is probably one of the better replacements, even The Black Knight).
It'll help, I would recommend, if you want to play a deck like this that you have some prior experience playing Rogue and a firm grasp on how Hearthstone works and the cards it contains.
As any Rogue deck, keep the usual suspects in your opening hand for some early removal.
Backstab, Swashburglar (summons Patches the Pirate for early removal).. you should know the drill by now.
As for midgame, well It's hard to make any type of guide for that. Since most of the cards you'll play wont the be same you had the previous game(i.e play those 3 Tirions you got in your hand, or concede because of the 4x Totemic Mights...).
! This deck however, has other win conditions rather than "stealing the right card to win" and is usually the case when you do. A.k.a the beauty with the Rogue class. !
General small tips:
Don't hold your Ethereal Peddler for to long. Play it early rather than later(sometimes reducing 1 card is enough, 2 is the sweet spot).
Shadowcaster has some really cool interactions in this deck. Can YOU find them all(i.e Bounce 1/1 Flower and see what happens, or the other flower that destroys minions, no names given!) ;)
Ok that's it~
Don't say I didn't warn you!