Altaïr Ibn-La'Ahad + Bloodthirster + Roshan, Hidden Magister

Prerequisites

• An opponent cannot block creatures you control.
• You have a way to give Altaïr Ibn-La'Ahad vigilance.

Steps

1. 1Give Altaïr Ibn-La'Ahad vigilance by any method.
2. 2Declare Altaïr Ibn-La'Ahad as an attacker.
3. 3Altaïr Ibn-La'Ahad triggers, exiling Bloodthirster from your graveyard with a memory counter on it as it is an Assassin due to Roshan, and then creating a tapped and attacking token copy of each creature you own in exile with a memory counter on it.
4. 4Deal combat damage to an opponent using the Bloodthirster token.
5. 5The Bloodthirster token triggers, causing you to untap it and to get an additional combat phase after this one.
6. 6At the end of your combat phase, Altaïr Ibn-La'Ahad triggers, exiling the Bloodthirster token.
7. 7Move to your next combat phase, and declare Altaïr Ibn-La'Ahad as an attacker.
8. 8Altaïr Ibn-La'Ahad triggers, creating a tapped and attacking token copy of each creature you own in exile with a memory counter on it.
9. 9Repeat from step 4.

Effects

• Infinite combat damage
• Infinite combat phases
• Infinite creature ETB
• Infinite creature LTB