Main Deck
Legendary Fire King Ponix is your starter , always play at 3, it searches for your engine and utility archetype cards like Circle of the Fire Kings and Fire King Sky Burn and is a reccurable body to destroy every turn, also it is a one card combo that ends up on Garunix Eternity, Hyang of the Fire Kings , the combo is:
You summon Legendary Fire King Ponix search for Fire King Sanctuary , place Fire King Island on the field(cannot be negated by Ash Blossom & Joyous Spring ), then you destroy Legendary Fire King Ponix with Fire King Island to search for Sacred Fire King Garunix , Sacred Fire King Garunix would then trigger to get special summoned , even thought it wasnt in your hand when the destruction happened , triggering itself to destroy a fire monster in your deck chosing Fire King Avatar Barong , during the opponent's standby phase Fire King Avatar Barong triggers , searching for Fire King High Avatar Kirin and then Legendary Fire King Ponix triggers returning to your hand , then Fire King High Avatar Kirin can special summon itself by destroying Legendary Fire King Ponix and Fire King Sanctuary allows you to overlay Sacred Fire King Garunix and Fire King Avatar Kirin for Garunix Eternity, Hyang of the Fire Kings whenever an opponent special summons a monster, wipping out the entire field.
Circle of the Fire Kings is nice to fight against interaction by switching a monster in your graveyard for a monster in the field, destroying the monster on the field and triggering its effects. Most common uses are to dodge targeted interaction like Infinite Impermanence or Effect Veiler while you combo or to push for lethal during Battle Phase by switching a monster on the field that attacked with a new one in the GY.
Fire King Sky Burn is great board breaker that synergizes with your fire king cards and is searchable.
Sacred Fire King Garunix is the main card of the deck , destruction of Fire monster cards Anywhere can trigger it to special summon and pop a new Fire monster Anywhere, its the heart of your plays, depending on what you pop , you can do a variety of plays. We use 2 of these since we play on Budget we dont have good consistency options , unlike most competitive Fire King decks that want Sacred Fire King Garunix in Deck to search with engine , we can start off our plays with Sacred Fire King Garunix in Hand and some way to destroy our Fire monsters.
Fire King High Avatar Kirin is the second main card , it is the only card that destroys and also likes beeing destroyed , its main appeal is its ability to destroy your cards in Quick Play speed which means that you can have turn 0 plays with a correct hand like ( Fire King High Avatar Kirin + Sacred Fire King Garunix and one random fire monster = Sacred Fire King Garunix and Fire King Avatar Kirin on the field and a destruction effect to trigger) or (2 Fire King Avatar Kirin can allow for a turn 0 pop by using one to destroy the other), and many more ways to use Fire King High Avatar Kirin .
Fire King Avatar Arvata is a normal summon that can negate monster effects which is the most common form of interaction, it is particulary good at helping you push through handtraps , if you can avoid using your normal summon(whichis very likely if you have Fire King Sanctuary in hand already)
Fire King Avatar Barong is your secondary searcher, unlike Legendary Fire King Ponix it comes with a delay , but has a wider pool to search cards from since it searches for any fire king card.
Fire King Avatar Kirin has some cool interactions in the deck, if you have either Fire King Island or Fire King Sanctuary and Fire King Avatar Kirin in your hand you can destroy Fire King Avatar Kirin using Fire King Island then search for Fire King High Avatar Garunix , special summon using its own effect , Fire King Avatar Kirin then sends Legendary Fire King Ponix to the graveyard , Fire King High Avatar Garunix then destroys Fire King High Avatar Kirin in the deck to special summon Legendary Fire King Ponix from the graveyard , Legendary Fire King Ponix then searches for Circle of the Fire Kings to destroy itself to special summon Fire King High Avatar Kirin and from there you can go to Garunix Eternity, Hyang of the Fire Kings .
Fire King Avatar Kirin also helps end up on an OTK after a succesful Garunix Eternity, Hyang of the Fire Kings field wipe , you can destroy Garunix Eternity, Hyang of the Fire Kings using either Fire King Island or a spell/trap , to special summon minimum 2 of either Fire King High Avatar Kirin or Sacred Fire King Garunix having at least 2400 + 2700 ATK on field , Sacred Fire King Garunix then triggers to destroy Fire King Avatar Kirin from anywhere gaining 500 ATK, and Fire King Avatar Kirin sends Blaster, Dragon Ruler of Infernos from your deck to your hand , then you can banish any 2 fire monsters from graveyard (you already have at least Fire King Avatar Kirin and Garunix Eternity, Hyang of the Fire Kings ) to special summon Blaster, Dragon Ruler of Infernos ending on a total of 8400 ATK enough to OTK most times.
Blaster, Dragon Ruler of Infernos hand effect is also very relevant to destroy cards on the field(your own too if you have to) and a body of 2800 ATK to help pressure , as well as a recurring Fire attribute body to use for your cards.
Fencing Fire Ferret is played as a one of as an option to use its destruction effect instead of Fire King High Avatar Kirin if you need to.
Fire King Avatar Rangbali is also played as a one of in the main to have an option going first blind against spell/traps.
One of Fire King High Avatar Garunix to have an option for a field wipe that is more accesible than Garunix Eternity, Hyang of the Fire Kings , can also loop with Sacred Fire King Garunix . Sacred Fire King Garunix destroys Fire King High Avatar Garunix on summon , on next standby phase , Fire King High Avatar Garunix special summons itself destroying every monster including Sacred Fire King Garunix then whenever any fire monster gets destroyed , Sacred Fire King Garunix can be special summoned , destoying Fire King High Avatar Garunix again and going over this again.
Ash Blossom & Joyous Spring , Infinite Impermanence and Effect Veiler are your handtraps, overal strong going blind against most decks.
The Cuckoo Commanded to Croon is an interesting card i am trying , its typing and attribute synergize with the deck also it self destructs to draw a card which is a card neutral trade (like Upstart Goblin ) it costs us a normal summon usually but it can trigger our Sacred Fire King Garunix or our other Fire King monster effects to special summon themselves.
One for One is here to help us see Legendary Fire King Ponix as often as we can.
Offerings to the Doomed is a cool card since it helps as a (kinda bad) boardbreaker going second , as Interaction going first and it can also be used to destroy your own stuff it is kinda like a worse 4th Fire King High Avatar Kirin .
Fire Formation - Tenki to search for your Beast-Warrios(all our lv4 Fire kings are) we mostly search for Fire King Avatar Arvata .
Extra Deck
Divine Arsenal AA-ZEUS - Sky Thunder (yes is not budget, but i have one and i use it, its not mandatory but Xyz deck , can use Zeus , so i may as well).
Garunix Eternity, Hyang of the Fire Kings is your main payoff , wipes the field of monsters, destroys spel/traps , special summons its materials on desruction , everything you want this card does it
Coach King Giantrainer is an alternative rank 8 option , can draw some cards , do some burn damage.
Diamond Dire Wolf is used to destroy problematic cards by destroying your own stuf which is synergistic but you wont often have 3 bodies to make use of it
Castel, the Skyblaster Musketeer is here to help us deal with indestructible cards on the field which the rest of our deck has trouble dealing with.
Time Thief Redoer is a great card to use in drawn out games since it can avoid beeing destroyed and expends your opponent's resources by attaching them as material
Daigusto Emeral is used to recucle our monsters in drawn out games to reuse since we end up burning our deck kinda fast and we dont have much good targets to destroy with Sacred Fire King Garunix .
Tantrum Toddler is interesting since we have a decent ammount of negates to advance it , and its effects are very synergistic to the deck , it dodges our field nukes if it has 4 materials which is instantly if you negate one card, and at 8 materials it becomes Divine Arsenal AA-ZEUS - Sky Thunder .
Hiita the Fire Charmer, Ablaze and Duelittle Chimera are used to send our monsters to the graveyard(mostly Sacred Fire King Garunix to reuse its effect on next turn) , Hiita the Fire Charmer, Ablaze can be used to extend if enemy ha Fire monsters in their GY. and Duelittle Chimera triggers its destruction effect with your own effects as well.
I:P Masquerena and Knightmare Unicorn budget option to S:P Little Knight (unfortunately i dont have one lying around and its too expensive to bother)
Jet Warrior to make use of Jet Synchron , helps deal with problematic cards, its graveyard effect has never realy mattered since we dont have a use for a lv5 body and the monster we would trade for it (pretty much only Legendary Fire King Ponix ) doesnt have much uses in the GY.
Gaia Blaze, the Force of the Sun can be made with any of your lv4 + Ash Blossom & Joyous Spring or Ghost Belle & Haunted Mansion , decent to push for damage or recurr your Fire Monsters.
Side Deck
Dogoran, the Mad Flame Kaiju is here to claim its kaiju slot for the side deck to deal with monsters that are hard to remove , Dogoran, the Mad Flame Kaiju is chosen as the kaiju of choice purely for its Fire attribute to synergize with your deck in case its needed.
Cosmic Cyclone and Sacred Phoenix of Nephthys to deal with spell/trap heavy decks along with an extra Fire King Avatar Rangbali .
Ghost Belle & Haunted Mansion is very good on game 2 of a series since graveyard hate is quite common and S:P Little Knight is everywhere to disrupt you, and GY banishment is very annoying for this deck.
Called by the Grave to help fight handtraps since this isnt the most consistent deck ever.
Droll & Lock Bird to fill the sideboard cause whynot.