Éomer, Marshal of Rohan + Altaïr Ibn-La'Ahad + Umbral Collar Zealot + Ashes of the Fallen

Éomer, Marshal of Rohan

Altaïr Ibn-La'Ahad

Umbral Collar Zealot

Ashes of the Fallen

How it works

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

This intricate loop centers around Altaïr Ibn-La'Ahad, whose attack trigger populates the battlefield with tapped and attacking token copies of creature cards in your graveyard bearing memory counters. To make this work, Ashes of the Fallen is crucial for bestowing the Assassin creature type upon everything in your graveyard, ensuring Altaïr can target and copy your legends. Once the copies swing alongside Éomer, Marshal of Rohan, you sacrifice one of those legendary tokens to Umbral Collar Zealot's activation cost; this death triggers Éomer to untap all your creatures and grant you an additional combat phase, allowing you to repeat the cycle endlessly.