This deck got me in arena 8 I think is a pretty good deck.
There some few combos:
offensive: place sparky behinde 1 of the towers and the put an wizard behind him so the sparky take all damage, and then put the hog on the other side.
defensive:when an hog,elite barbs., and other place the furnance to distract them and use the skeleton army or ice spirit.
You can replace : Ice spirit with fire spirtits
Hog with mini pekka