Boomsday Topsy Turvy Combo Priest

Play buffs on Test Subject, copy him, and get duplicates of them back. Then, play Twilight Drake, Lyra, or Steambot and use those buffs to grow them, and if it's Twilight Drake or Lyra, you have 5 cards in the deck that give them an inner fire effect: 2 Topsy Turvy, 2 Inner Fire, and 1 Crazed Alchemist. Go full northshire if you like with Wild Pyro and go miracle with Lyra if it stays up. Replicate and 2 Vivid Nightmare are provided to copy Test Subject AND come back as spells.