Mortuary + Gray Merchant of Asphodel + Umbral Collar Zealot + Bolas's Citadel

Prerequisites

• Your life total is at least 6 if Gray Merchant is on the top of your library, or you have available otherwise.

Steps

1. 1Cast Gray Merchant either from your hand by paying or from the top of your library by paying 5 life.
2. 2When 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. 3Activate Umbral Collar Zealot by sacrificing Gray Merchant.
4. 4When Gray Merchant dies, Mortuary triggers, putting Gray Merchant from your graveyard onto the top of your library.
5. 5Resolve the Umbral Collar Zealot ability.
6. 6Repeat.

Effects

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