Thats a lot, and lets look at the breakdown for how many of each type there are in that slot
Magnezone has a big role in this deck by letting you play extra Lightning Energy from your hand every turn, and Volkner can make sure theres Energy in your hand to play
Willow Geist, Stonebound Mentor, Fuming Effigy, Quintorius, Field Historian, Tormod, the Desecrator, and Defiled Crypt all care about cards that leave your graveyard, and turn them into strong value engines
It encourages aggressive use of the combat phase even from controlling decks, creates interesting mind games, and opens up avenues to play cards which would not be close to Constructed otherwise
Sleepy comes into play exerted because hes so sleepy, and when Dopey gets banished, the rest of the Dwarfs go into a blood rage and gain +2 strength to avenge him
Weve captured the haunted tech of the House in cards with the paranormal frame