Aurelia, the Warleader, Splinter Twin, and Mirror Box

Prerequisites

• Aurelia, the Warleader on the battlefield
• Splinter Twin on the battlefield
• Mirror Box on the battlefield
• Spinter Twin attached to Aurelia

Steps

1. During your combat phase, activate the nontoken Aurelia by tapping it, creating a token copy of itself
2. Declare the token Aurelia as an attacker
3. The token Aurelia triggers, untapping all creatures you control and causing you to 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