Activate Ashnod's Altar by sacrificing Restless Apparition, adding {C}{C}.
When Restless Apparition dies, its persist ability and Necrosynthesis trigger.
Resolve the Restless Apparition trigger, returning it from your graveyard to the battlefield with a -1/-1 counter and a vigilance counter on it.
Resolve the Necrosynthesis trigger, putting a +1/+1 counter on Tayam.
Activate Tayam by paying {3}, removing a +1/+1 counter from Tayam, and both counters from Restless Apparition.
Holding priority, activate Ashnod's Altar by sacrificing Restless Apparition, adding {C}{C}.
Repeat steps 2-4 one additional time.
Activate Ashnod's Altar by sacrificing Restless Apparition, adding {C}{C}.
Resolve Tayam's ability from step 5, causing you to mill three cards and returning Restless Apparition from your graveyard to the battlefield.
Repeat.

Infinite +1/+1 counters on a creature

Infinite colorless mana

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite self-mill

Put a selection of permanant cards from your library and graveyard onto the battlefield

Tayam, Luminous Enigma

Necrosynthesis

Ashnod's Altar

Restless Apparition

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

Sengir, the Dark Baron

Activate Kykar by sacrificing Restless Apparition, adding {R}.
Restless Apparition dies, triggering its persist ability, returning it from your graveyard to the batltefield without a -1/-1 counter on it due to Solemnity.
Repeat.

Infinite red mana

Kykar, Wind's Fury

Solemnity

Combos with "Restless Apparition"