Mortuary, Gray Merchant of Asphodel, Yahenni, Undying Partisan, and Gwenom, Remorseless

Prerequisites

• Mortuary on the battlefield
• Gray Merchant of Asphodel in hand or in the library
• Yahenni, Undying Partisan on the battlefield
• Gwenom, Remorseless on the battlefield

Steps

1. Cast Gray Merchant either from your hand by paying or from the top of your library by paying 5 life
2. When Gray Merchant enters, it triggers, causing each opponent to lose life equal to your devotion to black and causing you to gain life equal to the life lost this way
3. Activate Yahenni by sacrificing Gray Merchant
4. When Gray Merchant dies, Mortuary triggers, putting Gray Merchant from your graveyard onto the top of your library
5. Resolve the Yahenni ability
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite lifegain triggers
• Infinite lifegain
• Infinite lifeloss