Mulligans
General Mulligans
You need low cost taunts and wild growth to gain mana for them.
Midrange Mulligans
Search for taunts and removals just like with aggro. But you also can search for silence or ooze, that relies on what midrange deck you faced.
Control Mulligans
For control deck you can search for mana gain. Or maybe even Oakheart.
Idea of this deck is to live on early turns because of Taunts and then destory your opponet with neverending taunts from hadronox. Spreading Plague and removals also help you with that. On 9 Turn u can summon master oakheart which will recuit more taunts and hadronox.
You can destroy him with Naturalize and Carnivorous Cube. Then revive him wit h Witching hour or if you destroyed it with cube he can be returned that way too. This deck contains Malfurion the Pestilent and Branching Paths to help you with direct face damage decks. Also contains some big taunts to revive with hadronox.
Also there are some things to help you with warlocks such as Acidic Swamp Ooze and Spellbreaker
Warlock will lose N’Zoth so maybe druid will be king of Taunts in new addon! This deck relies on WItching hour alot as it gives you much resourses and thats why its theorycraft.