Ultimate Mill Shaman

Preparation: Play all minions, Play Murmuring Elemental and Grumble, Worldshaker in the same turn to get a 1-cost Murmuring

Combo turn: Shudderwock + Murmuring Elemental to guarantee a Shudderwock in your hand

Da Undatakah gives Shudderwock Deathlord's deathrattle to summon a minion from your opponent's deck and Dancing Swords to make your opponent draw cards from their deck. When the Shudderwocks are Grumble'd back into your hand, they die and trigger these deathrattles.

Meanwhile Dirty Rat and Unseen Saboteur will clear your opponent's hand, and Primordial Drake will kill any minions summoned.

Budget Version: No Da Undatakah and Hecklebot instead, but your opponent's spells in their deck won't draw so the combo takes longer.