Combat Celebrant + Helm of the Host

Prerequisites

• Helm of the Host attached to Combat Celebrant.

Steps

1. 1At the beginning of your combat phase, Helm of the Host triggers, creating a token copy of Combat Celebrant with haste.
2. 2Declare the token Combat Celebrant as an attacker choosing to exert it as it attacks.
3. 3The Combat Celebrant copy triggers, untapping all other creature you control and causing you to get an additional combat phase after this one.
4. 4Repeat.

Effects

• Infinite combat phases
• Infinite ETB
• Infinite mana creatures you control can produce
• Infinite tapped creature tokens
• Infinite untap of creatures you control