I'll start this out by saying that this deck should cost you anywhere from $80 - $130, depending on where you buy your cards from (and this is excluding the side deck recommendations or tech options).
Utopia package in side deck is for whether or not you wish to build the Kali Yuga lockdown variant, in which case you need Utopia Kaiser, Kali Yuga, Big Eye, and Utopia Double+Double or Nothing.
Other than that, go wild. It's better to experiment and find out what build suits your playstyle and/or meta.
PK Fire is a very unique deck that combines the use of the Phantom Knights as an easy level 3 engine that can provide relevant forms of offensive and defensive plays, namely being able to set multiples of one of the best trap cards in the game: Phantom Knights' Fog Blade. On top of this, the Burning Abyss monsters provide an easy link climbing route and can also be utilized for Phantom Knights plays, such as summoning Break Sword and (more relevantly) Rusty Bardiche.
Not to mention, the Burning Abyss cards allow you to play through disruptions and can help pick apart an established board, or at the very least force bait negations/interruptions.
120
300
630
600
