Éomer, Marshal of Rohan + Altaïr Ibn-La'Ahad + Altar of Dementia + Maskwood Nexus

Éomer, Marshal of Rohan

Altaïr Ibn-La'Ahad

Altar of Dementia

Maskwood Nexus

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 Altar of Dementia 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 Altar of Dementia ability.
5. Repeat during each combat phase.