Su-Chi + Oathkeeper, Takeno's Daisho + Arcane Adaptation + Altar of Dementia

Su-Chi
Oathkeeper, Takeno's Daisho
Arcane Adaptation
Altar of Dementia

Requires
Su-Chi must be on the battlefield. Oathkeeper, Takeno's Daisho must be on the battlefield. Arcane Adaptation must be on the battlefield. Altar of Dementia must be on the battlefield. Oathkeeper attached to Su-Chi. "Samurai" chosen with Arcane Adaptation.
Steps
  1. Activate Altar of Dementia by sacrificing Su-Chi.
  2. Su-Chi and Oathkeeper triggers.
  3. Resolve the Su-Chi trigger, adding cccc.
  4. Resolve the Oathkeeper trigger, returning Su-Chi to the battlefield.
  5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Su-Chi's power.
  6. Equip Oathkeeper to Su-Chi by paying 2.
  7. Repeat.
Results
Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite mill. Infinite sacrifice triggers. Infinite self-mill.

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