3-card OTK (going second, or during mid-late game)

Requirements

• Cards in hand:
  • Legendary Fire King Ponix
  • Sacred Fire King Garunix (can be in the GY too)
  • Fire King Island (or it can active on the field; or have Fire King Sanctuary in hand instead)
• Cards in deck:
  • Circle of the Fire Kings
  • Fire King High Avatar Kirin
  • Fire King Avatar Arvata
• Cards in Extra Deck:
  • Garunix Eternity, Hyang of the Fire Kings

When to perform this combo

You can attempt this OTK if your opponent has no monsters that are unaffected by card effects or that cannot be destroyed by them, otherwise you will need to calculate the damage output after battling that monster to ensure you can win the game this turn.

Mid-to-late game this should be much easier to perform as Island should be on the field, and Sacred Garunix will be in your GY, thus requiring just Ponix to pull off.

Steps:

Main Phase:

• Normal Summon Legendary Fire King Ponix.
• Activate Ponix's effect to add Circle of the Fire Kings to hand.
• (if needed) Activate Fire King Island; or activate Fire King Sanctuary and place Island in the Field Zone.
• Activate Island's effect to destroy Ponix and add Fire King High Avatar Kirin to hand.
• Activate Sacred Fire King Garunix's effect to Special Summon itself (from hand or GY).
• Activate Sacred Garunix's second effect to destroy Fire King Avatar Arvata.
• Activate Arvata's effect to Special Summon Ponix from GY.
• Activate Kirin's effect to destroy Ponix and Special Summon itself from hand.
• Xyz Summon Garunix Eternity, Hyang of the Fire Kings using Sacred Garunix and Kirin as material.
• Activate Hyang's effect to destroy all other monsters on the field.

Battle Phase:

• Attack with Hyang for 3000 damage.
• Activate Circle of the Fire Kings, destroying Hyang and Special Summoning Arvata from GY.
• Activate Hyang's effect, to Special Summon itself and Sacred Garunix from GY.
• Attack with all 3 monsters for game.

Notes

• Watch out for monsters that cannot be destroyed by battle. If they have enough ATK they can either reduce your damage output enough to make your opponent survive, or can cause you to be unable to run it over with all your monsters.
• Beware of your opponent's interruptions if attempting this going second! Any handtrap or negation can stop this combo immediately.
• Because we summon 5 times during the Main Phase, this combo triggers Nibiru, right as we Xyz Summon Hyang. However, we can recover using Circle.
  • Chain Circle to Nibiru's activation, destroying Hyang for Arvata/Ponix.
  • Nibiru resolves, tributing everything. Pray your opponent misplays and summons both Nibiru and the token in Attack Position.
  • Hyang activates, and you have two options.
    • If your opponent is below 4500 LP, Special Summon Hyang and Sacred Garunix from GY. Destroy Nibiru by attacking with Hyang, then attack with Sacred and the token for 4500.
    • Otherwise, Special Summon Arvata + Kirin. Here you can pass, having a negate off Arvata, a Special Summon + card pop from Kirin, a Ponix in hand during Standby, and Sacred in GY, enabling some follow-up. If you think you're able to pull it off, you can try for a second Hyang by destroying Ponix with Arvata instead of destroying Kirin, Special Summoning Sacred from GY with his own effect, then using Kirin and Sacred for Hyang via Fire King Sanctuary.