That's MrYagut's Yogg rogue . I've played it from rank 12 till 5 in one day on a win streak and it's suprisingly good.
ALL CARDS EXPLAINATION
Backstab - Perfect card for tempo swings ,combo activator , builds tokens and controls the early stages of the game.
Preparation - Makes sprint and every other big spell more efficent + builds tokens and allows huge board clears with spell power.
Argent Squire - Good against aggro / 1 mana combo activator and a sticky minion to work with .
Journey Below - Really usefull card , builds token , gives you deathrattle minons to work with + nzoth / 1 mana combo activator and token builder.
Bloodmage Thalnos - Card draw and Spell power
Eviscerate - Clear and face damage . Really good with spell power.
Sap - Huge card agains large minions . Helps regaining board control.
Edwin VanCleef - Interesting minion to threathen you'r opponent . Can unleash a huge bod early on.
Fan of Knives - Card draw and board clear . Perfect against aggro + spell power.
Shadow Strike - Clears huge minons .
SI:7 Agent - Board control . Perfect against aggro and makes good tempo swings.
Earthen Ring Farseer - Heal + good body for mana cost .
Tomb Pillager - Nice body + a precious coin and deathrattle
Sprint - Refill . Best with prep .
Violet Teacher - Build tokens and refills the board each turn .
Azure Drake - Draw , Spel power
N'Zoth, the Corruptor - Late game titan which seals the game .
Yogg-Saron, Hope's End - You'r Last hope if you've fallen behind . If the Rng is good it can tunr the game in you'r favor .