Requires

Tayam, Luminous Enigma must be on the battlefield. Sengir, the Dark Baron must be on the battlefield. Ashnod's Altar must be on the battlefield. Butcher Ghoul must be on the battlefield. Butcher Ghoul does not have a +1/+1 counter on it. Mana needed:

Steps

1. Activate Ashnod's Altar by sacrificing Butcher Ghoul, adding .
2. When Butcher Ghoul dies, its undying ability and Sengir's first ability trigger.
3. Resolve the Butcher Ghoul trigger, returning it from your graveyard to the battlefield with a +1/+1 counter and a vigilance counter on it.
4. Resolve the Sengir trigger, putting two +1/+1 counters on Sengir.
5. Activate Tayam by paying , removing a +1/+1 counter from Sengir, and both counters from Butcher Ghoul.
6. Holding priority, activate Ashnod's Altar by sacrificing Butcher Ghoul, adding .
7. Repeat steps 2-4 one additional time.
8. Activate Ashnod's Altar by sacrificing Butcher Ghoul, adding .
9. Resolve Tayam's ability from step 5, causing you to mill three cards and returning Butcher Ghoul from your graveyard to the battlefield.
10. Repeat.

Results