Hearthpwn

Im running something similar, but I think there is 1 card you have missed. The usual combo is Spiritsinger Umbra + Expired Merchant + Mortal Coil which gives me 4 DKs. With this combo I could outvalue even big priest.

Im still experimenting with different cards, but at this point Im not even sure that N'Zoth is needed when you can have 4 Gul'dans.

I think Umbra is too gready and useless because you can't do it consistently and every slot matters. You win big priests anyway in lategame, the problem is Barnes/Vargoth early turns. And Umbra doesn't do anything against it

Umbra is a tech card for the slower matchups. When you draw most of your deck, you will find the combo consistently. Against early Barnes/Vargoth I would recommend Tinkmaster Overspark.

Quote from jmke >>

does the deathrattle stack? I'm guessing if you play Merchant with Brann you'll discard 2 cards, and only get 2 back...

I have never tested it. But obviously it will discard 4 and return 2. Because Brann doubles Battlecry and doesn't double deathrattle. It's the same when you Cube a minion with Brann

Do you think it's better to run Emperor Thaurissan for Brann Bronzebeard + Zola the Gorgon + Gnomeferatu or is Brann Bronzebeard + Expired Merchant + Mortal Coil (on N'Zoth, the Corruptor and Bloodreaver Gul'dan enough)? I haven't faced any control decks yet, but I feel the latter is much better, I'll probably take out Emperor for Loatheb.

Well Right now I want to try more new cards as possible, to refresh renolock, and maybe the style also. I have different version in my collection and finding the best one. And I don't want to change the list by one card every day. So I am going to make change when I make sure I found the most optimized one. 

does the deathrattle stack? I'm guessing if you play Merchant with Brann you'll discard 2 cards, and only get 2 back...

You discard 2 of your highest cost cards and get 2 copies of both those cards when Merchant dies. Also if you have, for example, a 10 mana Kazakus potion besides N'Zoth and Gul'dan in hand, I believe it discards 2 cards at random so you can't setup what you want to discard.

Aranasi Bloodmother -> Rin or Fel Lord Betrug

Siphon Soul -> new dude for six mana - 7/5 demon with hard removal, its just better

Skulking geist -> Baleful Banker

Fel Lord Betrug in Renolock? This cards sucks 

Sihpon Soul is always better

Skulking Geist is for Jade Druid who is playing with Quest now. Baleful Banker was replaced by Expired Merchant

I think he meant the new card, the 7/5 demon that destroys a minion, kinda like vilespine, forgot the exact name and effect

EDIT: my bad, misread your comment, I actually agree with you