Rhys, the Evermore + Reveillark + Solemnity + Phyrexian Altar

Rhys, the Evermore

Reveillark

Solemnity

Phyrexian Altar

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 Phyrexian Altar by sacrificing Rhys.
4. Activate Phyrexian Altar 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. Repeat from step 2.