Activate Zack by paying {1} and sacrificing it.
When Zack dies, its persist ability and Pawn of Ulamog triggers.
Resolve the persist trigger, returning Zack from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect.
Resolve the Pawn of Ulamog trigger, creating a 0/1 Eldrazi Spawn creature token.
Resolve the Zack ability from step 1.
Activate the Eldrazi Spawn by sacrificing it, adding {C}.
Repeat.

Infinite creature ETB

Infinite creature LTB

Infinite death triggers

Infinite creature sacrifice triggers

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Zack Fair

Pawn of Ulamog

Activate Zack by paying {1} and sacrificing it.
When Zack dies, its persist ability and Sifter of Skulls triggers.
Resolve the persist trigger, returning Zack from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect.
Resolve the Sifter of Skulls trigger, creating a 1/1 Eldrazi Scion creature token.
Resolve the Zack ability from step 1.
Activate the Eldrazi Scion by sacrificing it, adding {C}.
Repeat.

Sifter of Skulls

Activate Zack by paying {1} and sacrificing it.
When Zack dies, its persist ability and Skittering Precursor triggers.
Resolve the persist trigger, returning Zack from your graveyard to the battlefield without a -1/-1 counter on it due to its replacement effect.
Resolve the Skittering Precursor trigger, creating a 0/1 Eldrazi Spawn creature token.
Resolve the Zack ability from step 1.
Activate the Eldrazi Spawn by sacrificing it, adding {C}.
Repeat.

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