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

Rhys, the Evermore

Reveillark

Solemnity

Altar of Dementia

How it works

1. Cast Rhys by paying 1 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.