About the archetype and the deck's main objective

  This deck focuses on three different things. One of them is taking board control against aggro decks with cards like Sethekk Veilweaver, Venomous Scorpid and Xyrella. It can take late board control against midrange decks with Call of the Grave, Lightshower Elemental, Soul Mirror, Mo'arg Forgefiend and N'Zoth, God of the Deep. With this expansion's newest cards, it can also win against control decks with Seek Guidance.

  One of the greatest resources of this deck last expansion were Draconic Studies, Renew, Wandmaker, and Palm Reading but with the addition of Call of the Grave, taking early board control will become much easier. Only weakness of this theorycraft is that there is only one 5-mana card, which I believe will not be much of a problem with the discover cards (which can also be fixed via swapping a card with Ogremancer).

  Now, let's talk about what to mulligan and how to play.

  Mulligan & How to Play

  Your utter goal with this archetype is to take the board in the early game and finishing with big minions as N'Zoth, God of the Deep and/or OTK'ing your opponent with Seek Guidance.

  Against aggro decks, I almost always held Holy Smite in the past as it was a great material for the early board control which also can be used together with Sethekk Veilweaver. The other cards you should aim for are Condemn, Wandmaker and Venomous Scorpid. I don't suggest holding Palm Reading as your hand might be too slow against an aggro deck. You also shouldn't hold the Seek Guidance, it would be super slow too as you don't aim to OTK your opponent.

  Against midrange decks like latest expansion's Miracle Rogue, Rush Warrior, Deathrattle Demon Hunter... you can still hold Holy Smite as it can help you stop your opponent taking early board control. Condemn would be slow against these decks as you might not play it until turn 5. Sethekk Veilweaver plays a huge role here as it is a target your opponent must destroy. Draconic Studies, Wandmaker, Call of the Grave, Venomous Scorpid, Palm Reading are great cards to hold too. You can hold Seek Guidance as long as the opponent doesn't have too aggresive of a playstyle.

  Against Control decks is the greatest part, as you can go for two win conditions in the same time: you will develop your tempo with how good the curve of the deck is, which will help you play N'Zoth, God of the Deep and/or finish Seek Guidance. You can hold Draconic Studies, Call of the Grave, Wandmaker, Sethekk Veilweaver, Palm Reading and Southsea Scoundrel. You should not lose your board control for too long until the OTK.

  The expansion's newest addition Mo'arg Forgefiend is the finisher blow before you play N'Zoth, God of the Deep and/or finish Seek Guidance.

  That's everything. Reviews and suggestions are super welcome.