This deck looks quite contradictory.
Play Zombie World and shut down your main motor for Vampires
Or play Vampire Kingdom and shut down your main motor for Plaguespreader Shyncros
Not to mention I see this bricking A LOT.
Zombie World is there primarily for Doomkaiser, although it can also be used as a way to ensure your opponent can't Summon Desperado during your Battle Phase.
Vampire Kindgom has, in my opinion, lost a lot of value since destruction by card effect is a lot less effective as a form of removal for threats like Shi En and Brave Neos.
The Deck, while testing, has displayed hardly any issue when it comes to consistency. I'm running 3 Gozuki, 2 Samurai Skull, and 2 Vampire's Desire, which can turn Retainer and Familiar into a combo starter.
I agree--at the very least, you should not play zombie world if you're playing the skill. Especially if you're only including the card for its interaction with one other card.
Still, I'd recomend Call of the Mummy instead of Zombie World, it helps a lot to quickly summon the Plaguespread shyncros, so in combination with Bonz's SKill, you may get out of a tight situation when playing at the right momment.