Orah, Skyclave Hierophant, Sister Hospitaller, Valiant Changeling, and Phyrexian Altar

Prerequisites

• Orah, Skyclave Hierophant on the battlefield
• Sister Hospitaller in the graveyard
• Valiant Changeling on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Phyrexian Altar 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. Activate Phyrexian Altar by sacrificing Sister Hospitaller
5. When Sister Hospitaller dies, Orah triggers, allowing you to return a Cleric with mana value 5 or less from your graveyard to the battlefield
6. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite colored mana
• Infinite death triggers
• Infinite lifegain
• Infinite lifegain triggers
• Infinite recursion of some creature cards in your graveyard
• Infinite sacrifice triggers