Marina Vendrell, Funeral Room // Awakening Hall, Thornbite Staff, and Viscera Seer

Prerequisites

• Marina Vendrell on the battlefield
• Funeral Room // Awakening Hall on the battlefield
• Thornbite Staff on the battlefield
• Viscera Seer on the battlefield

Steps

1. Activate Marina by tapping it, unlocking Awakening Hall
2. Awakening Hall triggers, returning all creature cards in your graveyard to the battlefield
3. Activate Viscera Seer by sacrificing one of the returned creatures
4. When the creature dies, Marina triggers, and Funeral Room triggers if it's unlocked
5. Resolve the Marina trigger, untapping it
6. Resolve the Funeral Room trigger, if applicable, causing each opponent to lose 1 life and you to gain 1 life
7. Resolve the Viscera Seer ability
8. Activate Marina by tapping it, locking Awakening Hall
9. Repeat steps 3 through 7 once
10. Repeat from step 1

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite lifegain
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite sacrifice triggers
• Infinite scry 1
• Infinite unlocking of Rooms you control