Feldon of the Third Path + Combat Celebrant + Determined Iteration Combo

Combat Celebrant in your graveyard.

Feldon of the Third Path and Determined Iteration on the battlefield.

Feldon does not have summoning sickness.

available

Activate Feldon by paying and tapping it, creating a token copy of Combat Celebrant with haste.

At the beginning of your combat phase, Determined Iteration triggers, creating a token copy of the Combat Celebrant token with haste.

Declare a Combat Celebrant token as an attacker, choosing to exert it as it attacks.

The token triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one.

Repeat from step 2.

Infinite combat phases

Infinite creature tokens with haste

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers