Sandstorm Crasher, and Aurelia, the Warleader

Prerequisites

• Sandstorm Crasher on the battlefield
• Aurelia, the Warleader on the battlefield
• undefined

Steps

1. Declare Aurelia and Sandstorm Crasher as attackers, choosing to exert Sandstorm Crasher as it attacks
2. Aurelia and Sandstorm Crasher each trigger
3. Resolve the Sandstorm Crasher trigger, creating a token copy of Aurelia that is tapped and attacking
4. Put the oldest Aurelia into your graveyard due to the legend rule
5. Resolve the Aurelia trigger, untapping all creatures you control and causing you to get an additional combat phase after this one
6. Repeat during each combat phase using the Aurelia token instead

Results

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