Altaïr Ibn-La'Ahad | Medomai the Ageless | Roshan, Hidden Magister

Cards

Declare
Altaïr Ibn-La'Ahad as an attacker.
Altaïr Ibn-La'Ahad triggers, exiling
Medomai the Ageless from your graveyard with a memory counter on it as it is an Assassin due to Maskwood Nexus, and then creating a tapped and attacking token copy of each creature you own in exile with a memory counter on it.
Deal combat damage to an opponent using the
Medomai the Ageless token.
The
Medomai the Ageless token triggers, causing you to take an extra turn after this one.
At the end of your combat phase,
Altaïr Ibn-La'Ahad triggers, exiling the
Medomai the Ageless token.
During the combat phase of your extra turn, declare
Altaïr Ibn-La'Ahad as an attacker.
Altaïr Ibn-La'Ahad triggers, creating a tapped and attacking token copy of each creature you own in exile with a memory counter on it.
Repeat from step 3.