yugioh speed duel starter decks twisted nightmares Deck Match Of The Millennium And Box Twisted Nightmares each contain 2 fully customizable Decks Into the Darkness Below -

Hazel didn't specify if this deck is better at going first or second at the start of the duel

The point is Mechtitan Core's activated ability, which should be fairly easy to pay for given the amount of vehicles and other artifacts that are in Buckle Up's decklist

Dharc the Dark Charmer, Gloomy allows you to "steal" a Dark monster from your opponent's graveyard, which can be quite relevant depending on the deck you are facing

Blink effects like Teleportation Circle and Conjurer's Closet set up a chain of value your opponents will struggle to overcome, especially with a sacrifice outlet to recur artifacts like Portal to Phyrexia and The Mightstone and Weakstone over and over