Terestian Illhoof (Heroid mode)

Basically what you have to do with this deck is to steal Imps from him, with Mind Vision or with Thoughtsteal, (why? because if you use imps against his own imps your imps will also come back to play, (example you have 2 imps he has 2 imps, you trade both imps, all imps come back to play and you dealt him 8 damage, plus if he uses cards to kill monsters he uses them on your imps, (more damange) ) once you achieve that is easy win, to save time and life you can Silence his imps so you’ll be able to kill them (without coming back), Shadow Word: Pain this is very important for the Imp gang boss, when you have as many imps as him you can use either Excavated Evil or Shadow Word: Horror and i’ll guarantee you a win, the rest is just surviving.

I succeeded with this deck on 1st attempt. 

I wanted to post this deck here, since I couldn’t find a way to achieve this Heroic mode with only free or not so difficult to get cards. Enjoy