Altaïr Ibn-La'Ahad + Port Razer + Roshan, Hidden Magister

Prerequisites

• An opponent cannot block creatures you control.

Steps

1. 1Declare Altaïr Ibn-La'Ahad as an attacker.
2. 2Altaïr Ibn-La'Ahad triggers, exiling Port Razer 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.
3. 3Deal combat damage to an opponent using the Port Razer token.
4. 4The Port Razer token triggers, causing you to untap all creatures you control and to get an additional combat phase after this one.
5. 5At the end of your combat phase, Altaïr Ibn-La'Ahad triggers, exiling the Port Razer token.
6. 6Move to your next combat phase, and declare Altaïr Ibn-La'Ahad as an attacker.
7. 7Altaïr Ibn-La'Ahad triggers, creating a tapped and attacking token copy of each creature you own in exile with a memory counter on it.
8. 8Repeat from step 3.

Effects

• Infinite combat damage
• Infinite combat phases
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control