Nobody expect Mecha'thun combo because cards it's very similiar as Renolock's.

You have plenty of clears and OP Zephrys the Great

EZ

Key cards:

Combopieces ofc - Bloodbloom, Cataclysm, Mecha'thun, Emperor Thaurissan

Defile - Perfect AoE

Zephrys the Great - Can easily win games to you

Kazakus - Friend to every situation

Voidcaller - Pulling any Demon from your hand is great

Zilliax - Important heal and small clear

Reno Jackson - No words needed

Lord Godfrey - Awesome AoE

Mal'Ganis - Summoned by Guldan wins you a lot games

Voidlord - Best defensive taunt

Bloodreaver Gul'dan - Heal.. wall of Demons.. dream