Aurelia, the Warleader, Nim Deathmantle, Ashnod's Altar, Savior of Ollenbock, and Mass Hysteria

Prerequisites

• Aurelia, the Warleader on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Savior of Ollenbock on the battlefield
• Mass Hysteria on the battlefield
• Aurelia has a higher power than Savior of Ollenbock

Steps

1. Declare Aurelia and Savior of Ollenbock as attackers, triggering Aurelia and Savior of Ollenbock's training ability
2. Resolve the Aurelia trigger, untapping all creatures you control and causing you to get an additional combat phase after this one
3. Holding priority, activate Ashnod's Altar by sacrificing Aurelia, adding
4. If Aurelia is your commander, choose not to return it to the command zone
5. When Aurelia dies, Nim Deathmantle triggers, choose not to pay for the trigger
6. Resolve the Savior of Ollenbock trigger from step 1, putting a +1/+1 counter on it
7. Savior of Ollenbock's second ability triggers, exiling Aurelia from your graveyard
8. Activate Ashnod's Altar by sacrificing Savior of Ollenbock, adding
9. When Savior of Ollenbock dies, its third ability and Nim Deathmantle trigger
10. Resolve the Savior of Ollenbock trigger, returning Aurelia from exile to the battlefield
11. Resolve the Nim Deathmantle trigger, causing you to pay to return Savior of Ollenbock from your graveyard to the battlefield, and attach Nim Deathmantle to it
12. Repeat each combat phase

Results

• Infinite combat phases
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers