Éomer, Marshal of Rohan, Kari Zev, Skyship Raider, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Éomer, Marshal of Rohan on the battlefield
• Kari Zev, Skyship Raider on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield
• Nim Deathmantle attached to Éomer
• Kari Zev does not have summoning sickness and cannot be blocked and killed by an opponent

Steps

1. Declare Kari Zev as an attacker
2. Kari Zev triggers, creating a legendary 2/1 Ragavan creature token that is tapped and attacking
3. Holding priority, activate Ashnod's Altar by sacrificing Ragavan, adding
4. When Ragavan dies, Éomer triggers, untapping all creatures you control and causing you to get an additional combat phase after this one
5. Activate Ashnod's Altar by sacrificing Éomer, adding
6. When Éomer dies, Nim Deathmantle triggers, causing you to pay to return Éomer from your graveyard to the battlefield, and attach Nim Deathmantle to it
7. Repeat each combat phase

Results

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