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

Prerequisites

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Steps

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

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite lifegain
• Infinite lifegain triggers
• Infinite mill
• Infinite recursion of some creature cards in your graveyard
• Infinite self-mill