Infinite creature ETBInfinite creature LTBInfinite colorless manaInfinite death triggersInfinite lifegainInfinite lifegain triggersInfinite recursion of some creature cards in your graveyardInfinite creature sacrifice triggers
How it works
Activate Ashnod's Altar by sacrificing Valiant Changeling.
When Valiant Changeling dies, Orah triggers, returning Sister Hospitaller from your graveyard to the battlefield.
When Sister Hospitaller enters, it triggers, returning Valiant Changeling from your graveyard to the battlefield and causing you to gain 7 life.
Activate Ashnod's Altar by sacrificing Sister Hospitaller.
When Sister Hospitaller dies, Orah triggers, allowing you to return a Cleric with mana value 5 or less from your graveyard to the battlefield.