Éomer, Marshal of Rohan + Altaïr Ibn-La'Ahad + Ashnod's Altar + Roshan, Hidden Magister

Éomer, Marshal of Rohan

Altaïr Ibn-La'Ahad

Ashnod's Altar

Roshan, Hidden Magister

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 Ashnod's Altar by sacrificing another legendary creature token except Éomer, adding CC.
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. Repeat during each combat phase.