This deck uses the new card Expired Merchant in conjunction with Cruel Dinomancer to get Deathwing, Dragonlords out early and summon more from your hand.

Not running Bloodreaver Gul'dan or N'Zoth, the Corruptor is probably a big mistake, but I wanted to make sure Deathwing, Dragonlord would always be the most expensive card in hand.

By having Expired Merchant as the only discard card in the deck, we can guarantee whatever it duplicates to be the only minion Cruel Dinomancer will summon.  The cool thing about doing this with Deathwing, Dragonlord is that when the copy summoned by Cruel Dinomancer dies or is triggered by Spiritsinger Umbra, it will then pull the two created by Expired Merchant out of hand making it a huge, multi-layered threat similar to interactions with Duplicate and Nine Lives.

I wasn't entirely sure what type of deck to put this combo into, so I decided to just shove it into one of my favorite Warlock decks as of now, Plot Twist Cubelock.