Éomer, Marshal of Rohan + Kari Zev, Skyship Raider + Helm of the Host + Altar of Dementia

Prerequisites

• Helm of the Host attached to Éomer.
• Kari Zev does not have summoning sickness and cannot be blocked and killed by an opponent.

Steps

1. 1At the beginning of your combat phase, Helm of the Host triggers, creating a nonlegendary token copy of Éomer with haste.
2. 2Declare Kari Zev as an attacker.
3. 3Kari Zev triggers, creating a legendary 2/1 Ragavan creature token that is tapped and attacking.
4. 4Holding priority, activate Altar of Dementia by sacrificing Ragavan.
5. 5When Ragavan dies, each Éomer that hasn't triggered this turn triggers, untapping all creatures you control and causing you to get at least one additional combat phase after this one.
6. 6Resolve the Altar of Dementia ability, causing target player to mill cards equal to Ragavan's power.
7. 7Repeat each combat phase.

Effects

• Infinite combat phases
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite creature tokens with haste
• Infinite death triggers
• Infinite mill
• Infinite self-mill