Orah, Skyclave Hierophant + Sister Hospitaller + Valiant Changeling + Altar of Dementia

Orah, Skyclave Hierophant

Sister Hospitaller

Valiant Changeling

Altar of Dementia

How it works

1. Activate Altar of Dementia by sacrificing Valiant Changeling.
2. When Valiant Changeling dies, Orah triggers, returning Sister Hospitaller from your graveyard to the battlefield.
3. When Sister Hospitaller enters, it triggers, returning Valiant Changeling from your graveyard to the battlefield and causing you to gain 7 life.
4. Resolve the Altar of Dementia ability.
5. Activate Altar of Dementia by sacrificing Sister Hospitaller.
6. When Sister Hospitaller dies, Orah triggers, allowing you to return a Cleric with mana value 5 or less from your graveyard to the battlefield.
7. Resolve the Altar of Dementia ability.
8. Repeat.

This crafty loop turns Orah, Skyclave Hierophant into a recursion engine by leveraging its trigger whenever a Cleric dies to pull Sister Hospitaller back from the graveyard. As Sister Hospitaller enters the battlefield, its ability immediately returns Valiant Changeling to play, a creature whose changeling nature conveniently ensures it shares creature types with your board. With Altar of Dementia ready to sacrifice these pieces for value, the cycle feeds itself continuously, milling your opponents out while generating endless entry, death, and lifegain triggers.