This is the deck i used to beat Chromaggus, i really had some issues with this fight.
The plan with this deck is basicly to establish board control and stall the game with removal while getting rid of the Corrupted cards he gives you,
Mulligan for Sorcerer's apprentice and Scientist and any cheap removal.
If possible avoid trading your apprentice as it will make it easier to get rid of the corrupted cards
When possible get Kt out behind a taunt and it's basicly a win.
Watch the video below for a close win
Hope this might help some people struggeling.