Orah, Skyclave Hierophant, Sister Hospitaller, Morophon, the Boundless, and Blasting Station

Prerequisites

• Orah, Skyclave Hierophant on the battlefield
• Sister Hospitaller in the graveyard
• Morophon, the Boundless on the battlefield
• Blasting Station on the battlefield

Steps

1. Activate Blasting Station by tapping it and sacrificing Morophon
2. When Morophon dies, Orah triggers, returning Sister Hospitaller from your graveyard to the battlefield
3. When Sister Hospitaller enters, it and Blasting Station trigger
4. Resolve the Blasting Station trigger, untapping it
5. Holding priority, activate Blasting Station by tapping it and 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 Blasting Station ability from step 5
8. Resolve the Sister Hospitaller trigger from step 3, returning Morophon from your graveyard to the battlefield and causing you to gain 7 life
9. When Morophon enters, it and Blasting Station trigger
10. Resolve the Morophon trigger, causing you to gain 1 life for each card in your graveyard
11. Resolve the Blasting Station trigger, untapping it
12. Resolve the Blasting Station ability from step 1
13. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite damage
• Infinite death triggers
• Infinite lifegain
• Infinite lifegain triggers
• Infinite recursion of some creature cards in your graveyard
• Infinite sacrifice triggers
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control