Aurelia, the Warleader, and Helm of the Host

Prerequisites

• Aurelia, the Warleader on the battlefield
• Helm of the Host on the battlefield
• Helm attached to Aurelia

Steps

1. At the beginning of your combat phase, Helm of the Host triggers, creating a nonlegendary token copy of Aurelia
2. Declare the token Aurelia as an attacker
3. The token Aurelia triggers, causing you to untap all creatures you control and get an additional combat phase after this one
4. Repeat each combat phase

Results

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