Chaos Jackal, Kuribandit is controlled milling. The idea is to fish out the Soul Charge and E-Tele, simple. It also gets darks consistently into the grave and will probably be the best opening move you can use some of the time. Why do Dragon Rulers use it? Setup. Why do Zombies use it? Setup. Why does Rulersworn use it? Yeah. As it stands, you might use Armageddon Knight also, but I'd only use one of Arma or Grepher because they clog normal summons. 3 Kuri and 2 Arma would do the trick, more Kuri because you need to rush your setup with this deck moreso than others and because the majority of your monsters have no qualms about being milled due Soul Charge. In addition, you can swap the Chains for Breakthrough Skills to circumvent this. Diamond Dude is more due to the high spell ratio you have and also so you have more targets for D-Draw, but yeah I don't like him either.