Altaïr Ibn-La'Ahad, Éomer, Marshal of Rohan, Redoubled Stormsinger, and The Animus

Prerequisites

• Altaïr Ibn-La'Ahad on the battlefield
• Éomer, Marshal of Rohan in exile
• Redoubled Stormsinger on the battlefield
• The Animus on the battlefield

Steps

1. Declare Redoubled Stormsinger and Altaïr as attackers, triggering their abilities
2. Resolve the Altaïr trigger, creating a tapped and attacking copy of Éomer
3. Resolve the Redoubled Stormsinger trigger, creating a tapped and attacking copy of Éomer
4. Put either Éomer token into your graveyard due to the legend rule, triggering the other Éomer token, causing you to untap all creatures you control and to get an additional combat phase after this one
5. At the end of your combat phase, Altaïr triggers, causing you to exile the Éomer token
6. Repeat each combat phase

Results

• Infinite ETB
• Infinite LTB
• Infinite combat phases
• Infinite death triggers
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control