Chthonian Nightmare + Priest of Gix + Skittering Precursor + Yahenni, Undying Partisan

Chthonian Nightmare
Priest of Gix
Skittering Precursor
Yahenni, Undying Partisan

Requires
Chthonian Nightmare must be on the battlefield. Priest of Gix must be on the battlefield. Skittering Precursor must be on the battlefield. Yahenni, Undying Partisan must be on the battlefield. You have at least eee.
Steps
  1. Activate Yahenni by sacrificing Priest of Gix.
  2. When Priest of Gix dies, Skittering Precursor triggers, creating a 0/1 Eldrazi Spawn creature token.
  3. Resolve the Yahenni ability.
  4. Activate Chthonian Nightmare by paying eee, sacrificing the Eldrazi Spawn and returning Chthonian Nightmare from the battlefield to your hand, returning Priest of Gix from your graveyard to the battlefield.
  5. When Priest of Gix enters the battlefield, it triggers, adding .
  6. Cast Chthonian Nightmare by paying 1.
  7. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get eee.
  8. Repeat.
Results
Infinite LTB. Infinite ETB. Infinite sacrifice triggers. Infinite death triggers. Infinite storm count. Infinite black mana.

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