This deck was featured in TotalBiscuits "Lord of the Gimmicks" series.
The idea behind this deck is to take the old spellpower rogue to it's natural and extreme conclusion, by including all spellpower minions in the game alongside some of the cheapest spells (which are found in the rogue deck), allowing for these spells to scale far beyond their usual effectiveness. The ideal situation is to establish a few spellpower creatures on the board while using early removal like backstab and shiv to maintain controls and then kill the opponent with very strong headcracks, eviscerates and sinister strikes.
If you want to meddle with the deck, the only cards outside of the gimmick theme are the two Mogu'shan Wardens, which I elected to put in there to allow my weaker spellpower minions to stay on the board longer than they otherwise would, as well as protect my face from aggro decks. They could be replaced by things like Faceless Manipulator if you wanted to clone Malygos or Ancient Maged minions, or Preparation for those looking for a big one-turn Malygos play. Sen'jin maybe more effective since it trades better, though it has less health. That slot really is open for experimentation.
As with all gimmick decks, do not expect effectiveness, though I was able to take this deck to Rank 12 with a solid win ratio.