Éomer, Marshal of Rohan + Altaïr Ibn-La'Ahad + Altar of Dementia + Roshan, Hidden Magister

Prerequisites

• Altaïr does not have summoning sickness.
• An opponent cannot block and kill Altaïr.
• You have at least one legendary creature card exiled with a memory counter on it.

Steps

1. 1Declare Altaïr as an attacker. Altaïr triggers, exiling Éomer from your graveyard with a memory counter on it, and then creating a tapped and attacking token copy of each card you own that is exiled with a memory counter on it.
2. 2Activate Altar of Dementia by sacrificing another legendary creature token except Éomer.
3. 3When the creature dies, Éomer triggers, untapping all creatures you control and causing you to get an additional combat phase after this one.
4. 4Resolve the Altar of Dementia ability.
5. 5Repeat during each combat phase.

Effects

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