Altaïr Ibn-La'Ahad, Éomer, Marshal of Rohan, Umbral Collar Zealot, and Arcane Adaptation Combo

Altaïr Ibn-La'Ahad, Éomer, Marshal of Rohan, Umbral Collar Zealot, and Arcane Adaptation

Here's how the cards Altaïr Ibn-La'Ahad, Éomer, Marshal of Rohan, Umbral Collar Zealot, and Arcane Adaptation results in Infinite LTB, Infinite ETB, Infinite sacrifice triggers, Infinite death triggers, Infinite combat phases, and Infinite surveil 1

Altaïr Ibn-La'Ahad

Éomer, Marshal of Rohan

Umbral Collar Zealot

Arcane Adaptation

Prerequisites

Altaïr Ibn-La'Ahad on the battlefield
Éomer, Marshal of Rohan in the graveyard
Umbral Collar Zealot on the battlefield
Arcane Adaptation on the battlefield

Steps

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