Éomer, Marshal of Rohan + Kari Zev, Skyship Raider + Helm of the Host + Ashnod's Altar

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 Ashnod's Altar by sacrificing Ragavan, adding .
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. 6Repeat each combat phase.

Effects

• Infinite colorless mana
• Infinite combat phases
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite creature tokens with haste
• Infinite death triggers