My goal since learning to play is to find a set of cards that was well rounded but importantly could win against the Orc/Skaven Rush decks since they are dominating the field right now. After long hours playtesting and tuning, swapping cards and testing some more. I finally found a set that I think can win reliably. Here it is.
Units:
3 x Shades
3 x Vile Sorceress
3 x Night Goblins (to destroy attachments and you can use Vile Sorceress to lower his HP if you need to bounce him with Har Ganeth to play and destroy another attachment)
3 x Savage Marauders (good first turn play for 5 power 2nd turn)
3 x Dark Zealot
3 x Bloodsworn (ideally 2nd turn play)
3 x Scheming Cultist (combo with Seduced and Chillwind to corrupt enemy units)
2 x Maledictor of Tzeentch
Tactics:
3 x Easy Pickin's
3 x We Need your Blood
3 x Chillwind
3 x Seduced by Darkness
3 x Tzeentch's Firestorm
Support:
3 x Cloud of Flies
2 x Daemon Sword
3 x Har Ganeth
3 x Contested Village
3 x Warpstone Excavation
Almost every card is designed to deal with enemy units or attachments (no support card destruction, but if needed, could easily sideboard pillage) An early Har Ganeth / Vile Sorceress or Shade will work to disrupt the tempo of the other player. Play your unit destruction cards asap to gain the tempo advantage. Use Daemonsword to pump up a Bloodsworn or Savage Marauders in the battlefield. Cloud of Flies on Bloodsworn is an excellent combo but don't be afraid to play cloud of flies on a dark zealot early in the game. Scheming Cultist is a new addition from the recent expansion and does a great job of replacing nurgle sorcerer.
Clamitus posted an Orc/Skaven deck that he challenged for us to post a deck that beat it >50% of the time. This is the deck. This would definately have problems against bolt thrower, but sideboard in 3 gutterrunners for an additional scouts and it will help.