Hearthpwn

The idea is Lich King will remove all the spells from your deck and it is effective to gather all the mecha'thun win conditions. 

Key Cards:

Mecha'Thun x1 

Doomsayer x 2 

Tech Cards: 

Novice Engineer x 2, cuz you need something to do at turn 2

Galvanizer x 2, enable to pull off the combo at turn 7-8

Emperor Thaurissan x1 , enable to pull off the combo at turn 7-8

Zephrys the Great x 1 

Escaped Manasaber x 1, (optional - allow win condition variations to work with Zephry, or simply allow to make mistake)

Mulligan: Minions. As long as it is minions, keep them. To draft the rest of the deck with random spell 1-cost spell, maybe you got lucky/unlucky to play it at turn 1.