After a long first day of competition in Swiss format, only 8 players (including DotA2 TI winner KuroKy) were left to fight for the title and the first place $4,000 prize. Ultimately, heffaklumpen's drafted deck and talent proved too strong for his opponents as he defeated his quarter-finals, semi-finals, and finals opponents without dropping a single game, ending his tournament run with a flawless 13-0.
The tournament saw a good variety of decks as it was played in draft mode and competitors had to pick the best cards they could get. The players that went the furthest in the tournament were almost all running a two-color deck, but we got to see an interesting 4-color deck (or 'rainbow' deck) ran by the Chinese player 张伯伦 (or Chamberlain). Unfortunately for him (and for our curiosity), he would end his tournament on a disconnection loss against the eventual finalist, Mogwai.
You can find all the information about the preview tournament decks and cards stats on Artifaction's website.