Activate Reflection of KIki-Jiki by paying {1} and tapping it, creating a token copy of Combat Celebrant with haste.
Declare Klauth and Combat Celebrant token as attackers, choosing to exert Combat Celebrant as it attacks.
When you attack, Klauth and the Combat Celebrant token trigger.
Resolve the token's trigger, untapping all other creatures you control and causing you to get an additional combat phase after this one.
Resolve Klauth's trigger, adding mana.
Repeat.

Infinite colored mana

Infinite combat phases

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite creature tokens with haste

Infinite death triggers

Fable of the Mirror-Breaker // Reflection of Kiki-Jiki

Combat Celebrant

Klauth, Unrivaled Ancient

Declare Charnelhoard Wurm and Klauth as attackers.
Klauth triggers, adding at least {8}{R}{R} that can only be spent to cast spells.
Deal combat damage to an opponent using Charnelhoard Wurm.
Charnelhoard Wurm triggers, returning Relentless Assault from your graveyard to your hand.
Cast Relentless Assault by paying {2}{R}{R}, causing you to untap all creatures that attacked this turn and to get an additional combat and main phase after this one.
Repeat.

Infinite colored mana that can only be spent to cast spells

Infinite combat damage

Infinite magecraft triggers

Infinite storm count

Charnelhoard Wurm

Relentless Assault

Declare Klauth and any other creature, if needed, as an attacker.
Klauth triggers, adding at least {4}{R/W}{R/W} that can only be spent to cast spells.
At the beginning of your postcombat main phase, Kirri triggers, returning a land card from your graveyard to the battlefield.
Cast Waves of Aggression from your graveyard for its retrace cost by paying {3}{R/W}{R/W} and discarding a land card, causing you to untap all creatures that attacked this turn, and to get an additional combat and main phase after this one.
Repeat.

Infinite self-discard triggers

Kirri, Talented Sprout

Waves of Aggression

Declare Klauth and Soul of Windgrace as attackers.
When they attack, Klauth and Soul of Windgrace trigger.
Resolve the Klauth trigger, adding at least nine mana that you will not lose this turn as steps and phases end.
Resolve the Soul of Windgrace trigger, returning Rakdos Carnarium from your graveyard to the battlefield tapped.
When Rakdos Carnarium enters, it triggers, returning itself from the battlefield to your hand.
In your next main phase, cast Waves of Aggression from your graveyard for its retrace cost by paying {3}{R/W}{R/W} and discarding Rakdos Carnarium, causing you to untap all creatures that attacked this turn, and to get an additional combat and main phase after this one.
Repeat.

Infinite landfall triggers

Infinite untap of most creatures you control

Soul of Windgrace

Rakdos Carnarium

Combos with "Klauth, Unrivaled Ancient"