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 Tayam

Infinite colorless mana

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite self-mill

Put all permanents with a mana value of 3 or less 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.

Infinite +1/+1 counters on Sengir

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"