I'm playing a C'Thun, the Shattered Rogue deck which is immense fun. So much value and interesting, varied play patterns. My most recent game, against a Warlock, went to fatigue. The one before that was wrapped up early with a second turn 8/8 Edwin VanCleef.
I tried different rogue decks since the expansion came out: aggro, stealth, weapon, tempo but the most consistent deck with the best winrate for me so far is galakrond rogue. I like it even if it's nerfed now and sure I will miss it once it goes to wild so I'm abusing its power while it stays in standard. The deck is basically the old version with some new cards like the 2 mana spell that draws you one minion and a spell if you combo it, the 2 mana fox which is one of the best combo activators. You have huge value, big tempo swings with Edwin, Togwaggle, Galakdrond, Kronx and another card that I like in this deck is Yogg-Saron, Master of Fate. If you are losing this card can turn the tables and the effect is easily triggered with the amount of spells you have in deck and the ones you get from the ethereal lackey. Definitely a good deck for this expansion and the best feeling I had today was when my opponent had a board full of 8/8 Carnival Clown and then I played Flik Skyshiv, fastest concede ever.
Secret Miracle Rogue is a true control killer, very good against all the greed. It sucks that Evolve Shaman is playable again though, thats always bad news cuz shaman likes to spam the board every turn, but thats the only horrible matchup.