Teysa, Orzhov Scion + Darkest Hour + Altar of Dementia

Teysa, Orzhov Scion
Darkest Hour
Altar of Dementia

Requires
All permanents on the battlefield. An additional creature under your control.
Steps
  1. Sacrifice the additional creature to Altar of Dementia, milling target player 1
  2. Because of Darkest Hour, the creature is black, and thus triggers Teysa's ability, creating a 1/1 black Spirit token
  3. Sacrifice the token to Altar of Dementia, milling target player 1
  4. Teysa's ability triggers again, creating another token
Results
Infinite milll. Infinite sacrifice triggers. Infinite death triggers.