Mulligans
General Mulligans
This generally is the combo you're looking for in this order. Baleful Banker is to Garentee you have velen in your Zereks. or even Malygos with a coin. you should only need One coin to get double mindblast double smite off.
Aggro Mulligans
These cards will help with Sustaining the board and clearing Aggro type decks until you get your combo cards.
Just an idea, would love some feedback from people who can be productive and contribute to building this deck. It seems weird but what I went for is kinda a Res type of priest with enough board clear and healing with the spell damage drops and Spirit Lash to get through the early stages to stall with Primordial Drake Primordial drakes until either (hoping) you had a decent early game to pull a Zerek's Cloning Gallery with Shadow Visions or get to Zerek's Cloning Gallery to drop hopefully many and Prophet Velen plus 1 extra Spell Damage Minion to deal an substantial amount of damage with Coin 1 cost Mind Blast for instant death or double coin if you have 3 Mind Blast and smite for finisher.

































You probably can remove the vivid nightmare for more board control but i like the idea that you drawed alot of minions from the deck and you have enough space to be able to drop one or 2