Darien, King of Kjeldor + Sanguinary Priest + Altar of Dementia

Darien, King of Kjeldor
Sanguinary Priest
Altar of Dementia

Requires
All permanents on the battlefield. You control an additional creature.
Steps
  1. Sacrifice a creature to Altar of Dementia, targeting any player
  2. Sanguinary Priest triggers, dealing 1 damage to you and gaining 1 life
  3. Darien triggers, creating a 1/1 Soldier token
  4. Resolve the Altar of Dementia ability, causing the targeted player to mill cards equal to the sacrificed creature's power
  5. Repeat
Results
Infinite ETB. Infinite LTB. Infinite death triggers. Infinite lifegain triggers. Infinite mill. Infinite self-mill.