Mirror Image + Combat Celebrant + Unforgiving One + Altar of Dementia + Mass Hysteria

Prerequisites

• You control at least five modified creatures.
• An opponent is unable to block and kill creatures you control.
• You control a Mountain.

Steps

1. 1Declare Combat Celebrant and Unforgiving One as attackers, choosing to exert Combat Celebrant as it attacks.
2. 2Combat Celebrant triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one.
3. 3Unforgiving One triggers, returning Mirror Image from your graveyard to the battlefield as a copy of Combat Celebrant.
4. 4Activate Altar of Dementia by sacrificing Combat Celebrant, causing target player to mill cards equal to Combat Celebrant's power.
5. 5Move to your next combat phase.
6. 6Declare Mirror Image and Unforgiving One as attackers, choosing to exert Mirror Image as it attacks.
7. 7Mirror Image triggers, untapping all other creatures you control and causing you to get an additional combat phase after this one.
8. 8Unforgiving One triggers, returning Combat Celebrant from your graveyard to the battlefield.
9. 9Activate Altar of Dementia by sacrificing Mirror Image, causing target player to mill cards equal to Mirror Image's power.
10. 10Repeat.

Effects

• Infinite combat phases
• Infinite mana creatures you control can produce
• Infinite mill
• Infinite self-mill
• Infinite untap of creatures you control