Requires

Tayam, Luminous Enigma must be on the battlefield. Necrosynthesis must be on the battlefield. Ashnod's Altar must be on the battlefield. Geralf's Messenger must be on the battlefield. Necrosynthesis attached to Tayam. Geralf's Messenger does not have a +1/+1 counter on it. Mana needed:

Steps

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

Results