Cast Sozin's Comet either from your hand by paying {3}{R}{R} or from exile for its foretell cost by paying {2}{R}, causing each creature you control to gain firebending 5 until end of turn.
Declare Hellkite Charger and at least one other creature as attackers, triggering each creature's firebending ability and Hellkite Charger.
Resolve each firebending trigger, adding {R}{R}{R}{R}{R} for each attacking creature.
Resolve the Hellkite Charger trigger, causing you to pay {5}{R}{R} to untap all attacking creatures and to get an additional combat phase after this one.
Repeat from step 2 each combat phase.

Infinite combat phases

Infinite red mana

Infinite combat damage

Hellkite Charger

Sozin's Comet

Cast Sozin's Comet either from your hand by paying {3}{R}{R} or from exile for its foretell cost by paying {2}{R}.
Declare a creature as an attacker, triggering its firebending ability, adding {R}{R}{R}{R}{R}.
Move to your postcombat main phase. You will not lose the mana due to Ozai.
Activate Aggravated Assault by paying {3}{R}{R}, causing you to untap all creatures you control and to get an additional combat and main phase after this one.
Repeat from step 2.

Infinite untap of creatures you control

Infinite mana creatures you control can produce

Aggravated Assault

Ozai, the Phoenix King

Cast Sozin's Comet by paying {3}{R}{R}.
Declare Charnelhoard Wurm as an attacker, triggering its firebending ability, adding {R}{R}{R}{R}{R}.
Holding priority, cast Savage Beating by paying {3}{R}{R}, causing you to untap all creatures you control and get an additional combat phase after this one.
Deal combat damage using Charnelhoard Wurm, triggering its ability, returning Savage Beating from your graveyard to your hand.
Repeat from step 2.

Infinite storm count

Infinite magecraft triggers

Charnelhoard Wurm

Savage Beating

Cast Sozin's Comet by paying {3}{R}{R}.
Declare Charnelhoard Wurm as an attacker, triggering its firebending ability, adding {R}{R}{R}{R}{R}.
Holding priority, cast Great Train Heist by paying {2}{R}{R}, selecting its first mode, causing you to untap all creatures you control and get an additional combat phase after this one.
Deal combat damage using Charnelhoard Wurm, triggering its ability, returning Great Train Heist from your graveyard to your hand.
Repeat from step 2.

Infinite tapped Treasure tokens

Infinitely powerful creatures you control until end of turn

Great Train Heist

Combos with "Sozin's Comet"