Rhys, the Evermore, Reveillark, Solemnity, and Altar of Dementia

Prerequisites

• Rhys, the Evermore in hand or in the command zone
• Reveillark on the battlefield
• Solemnity on the battlefield
• Altar of Dementia on the battlefield
• plus commander tax if applicable available

Steps

1. Cast Rhys by paying plus commander tax if applicable
2. When Rhys enters, it triggers, giving Reveillark persist until end of turn
3. Activate Altar of Dementia by sacrificing Rhys
4. Activate Altar of Dementia by sacrificing Reveillark
5. When Reveillark dies, its ability and its persist ability trigger
6. Resolve the persist trigger, returning Reveillark from your graveyard to the battlefield without a -1/-1 counter on it due to Solemnity
7. Resolve the second trigger, returning Rhys from your graveyard to the battlefield
8. When Rhys enters, it triggers, giving Reveillark persist until end of turn
9. Resolve the Altar of Dementia ability from step 4
10. Repeat from step 3

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill