Ayara, Widow of the Realm // Ayara, Furnace Queen, Combat Celebrant, and Phyrexian Altar

Prerequisites

• Ayara, Widow of the Realm // Ayara, Furnace Queen on the battlefield
• Combat Celebrant in the graveyard
• Phyrexian Altar on the battlefield
• Ayara on the battlefield as Ayara, Furnace Queen

Steps

1. At the beginning of your combat phase, Ayara triggers, returning Combat Celebrant from your graveyard to the battlefield and giving it haste
2. Declare Combat Celebrant as an attacker, choosing to exert it as it attacks
3. Combat Celebrant triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one
4. Activate Phyrexian Altar by sacrificing Combat Celebrant, adding one mana of any color
5. Repeat each combat phase

Results

• Infinite colored mana
• Infinite combat phases
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite sacrifice triggers
• Infinite untap of creatures you control