During your upkeep, activate Ashnod's Altar by sacrificing Kuldotha Phoenix, adding {C}{C}.
When Kuldotha Phoenix dies, Anax triggers, creating two 1/1 Satyr creature tokens.
Activate Ashnod's Altar by sacrificing a Satyr, adding {C}{C}.
Activate Kuldotha Phoenix by paying {4}, returning it from your graveyard to the battlefield.
Repeat.

Infinite colorless mana

Infinite creature tokens

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Anax, Hardened in the Forge

Kuldotha Phoenix

Ashnod's Altar

During your upkeep, activate Ashnod's Altar by sacrificing Kuldotha Phoenix, adding {C}{C}.
When Kuldotha Phoenix dies, Pawn of Ulamog triggers, creating a 0/1 Eldrazi Spawn creature token.
Activate Ashnod's Altar by sacrificing the Eldrazi Spawn, adding {C}{C}.
Activate Kuldotha Phoenix by paying {4}, returning it from your graveyard to the battlefield.
Repeat.

Pawn of Ulamog

During your upkeep, activate Ashnod's Altar by sacrificing Kuldotha Phoenix, adding {C}{C}.
Activate Kuldotha Phoenix by paying {2}, returning it from your graveyard to the battlefield.
Repeat.

Zirda, the Dawnwaker

During your upkeep, activate Ashnod's Altar by sacrificing Kuldotha Phoenix, adding {C}{C}.
When Kuldotha Phoenix dies, Sifter of Skulls triggers, creating a 1/1 Eldrazi Scion creature token.
Activate Ashnod's Altar by sacrificing the Eldrazi Scion, adding {C}{C}.
Activate Kuldotha Phoenix by paying {4}, returning it from your graveyard to the battlefield.
Repeat.

Sifter of Skulls

During your upkeep, activate Ashnod's Altar by sacrificing Kuldotha Phoenix, adding {C}{C}.
Activate Kuldotha Phoenix by paying {4}, returning it from your graveyard to the battlefield.
When Kuldotha Phoenix enters the battlefield, Blessed Sanctuary triggers, creating a 2/2 Unicorn creature token.
Activate Ashnod's Altar by sacrificing the Unicorn, adding {C}{C}.
Repeat.

Combos with "Kuldotha Phoenix"