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. Lesser Masticore must be on the battlefield. Lesser Masticore does not have a -1/-1 counter on it. Mana needed:

Steps

1. Activate Ashnod's Altar by sacrificing Lesser Masticore, adding .
2. When Lesser Masticore dies, its persist ability and Sengir's first ability trigger.
3. Resolve the Lesser Masticore 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 Lesser Masticore.
6. Holding priority, activate Ashnod's Altar by sacrificing Lesser Masticore, adding .
7. Repeat steps 2-4 one additional time.
8. Activate Ashnod's Altar by sacrificing Lesser Masticore, adding .
9. Resolve Tayam's ability from step 5, causing you to mill three cards and returning Lesser Masticore from your graveyard to the battlefield.
10. Repeat.

Results