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

Mortuary

Gray Merchant of Asphodel

Yahenni, Undying Partisan

Gwenom, Remorseless

How it works

1. Cast Gray Merchant either from your hand by paying 3 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.

This clever loop turns the graveyard into a reliable top-deck engine, letting you recast your threats directly off the library using Gwenom, Remorseless to bypass traditional mana costs by paying life instead. Yahenni, Undying Partisan acts as your reliable sacrifice outlet, feeding the cycle while sending Gray Merchant of Asphodel straight to the graveyard. Each time Gray Merchant hits the bin, Mortuary catches it and puts it right back on top of your library, ensuring the Merchant is immediately accessible to loop again. As the cycle repeats, the draining and lifegain from Gray Merchant's enters-the-battlefield trigger will quickly overwhelm your opponents.