Mikaeus, the Unhallowed + Yawgmoth, Thran Physician + Gray Merchant of Asphodel

Mikaeus, the Unhallowed

Yawgmoth, Thran Physician

Gray Merchant of Asphodel

How it works

1. Activate Yawgmoth by paying 1 life and sacrificing Gray Merchant, targeting any other nontoken non-Human creature you control.
2. Gray Merchant dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. Gray Merchant enters the battlefield, 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.
4. Resolve the Yawgmoth ability from step 1, putting a -1/-1 counter on the additional creature and causing you to draw a card.
5. Activate Yawgmoth by paying 1 life and sacrificing the additional creature, targeting Gray Merchant.
6. The creature dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
7. Resolve the Yawgmoth ability, putting a -1/-1 counter on Gray Merchant and causing you to draw a card.
8. Repeat.