Oh and I used Sacrificial deck.

I just beat heroic chapter 5 today. Probably more luck than anything:

Warlock – The Pact (summon 2/2 imp).
First treasure – Captured Flag (+1/+1)
Second treasure – First Aid Kit (heal +2 at end of each turn)

I’ll say its luck because of the treasures. Being able to make a 3/3 imp by round 2 and essentially losing no health from it was significant. On Khadgar fight they were key in destroying his 2/3 hero power each time. They never died since they would go 3/1 and heal full to 3/3. Only had to sacrifice them when needed to keep his side of the board cleared. Had his board cleared and he out of cards in his hand so he was only able to hero power and one card each hand, very easy to clear his board amd attack Khadgar after that.

All 12 bosses were fairly easy with this setup.

Happy adventuring!

This was absolute sound strategy.i beat both chapter 3 and 4 on my first try with this setup.