Wombo Combo Warlock (need to survive at least 6 turns to work)

In early: you play Meat Wagon , which you want to destroy on your turn. It summons aSummoning Portal , so u can play your big minions faster.

Skull of the Man'ari also summons your high cost demons on your Hand like Voidlord

you can Combo Medivh, the Guardian  into Twisting Nether or DOOM!  too 

It’s easy, you Play Spiteful Summoner , get a 8 or 10 drop out of DOOM!  or Twisting Nether 

Or you just Play Master Oakheart and get Voidlord , Dragonhatcher  and Tar Lurker , the Dragonhatcher  also summons Deathwing  or Deathwing, Dragonlord