Éomer, Marshal of Rohan, Altaïr Ibn-La'Ahad, Ashes of the Fallen, and Hammerhead, Maggia Boss

Prerequisites

• Éomer, Marshal of Rohan in the graveyard
• Altaïr Ibn-La'Ahad on the battlefield
• Ashes of the Fallen on the battlefield
• Hammerhead, Maggia Boss on the battlefield

Steps

1. Declare Altaïr as an attacker
2. 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
3. Activate Hammerhead by sacrificing another legendary creature token except Éomer
4. When the creature dies, Éomer triggers, untapping all creatures you control and causing you to get an additional combat phase after this one
5. Resolve the Hammerhead ability
6. Repeat during each combat phase

Results

• Infinite +1/+1 counters on a creature
• Infinite combat phases
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers