Color Identity: B

Prerequisites

  1.  
    Activated Sleeper
    Activated Sleeper
    in your graveyard.
  2.  
    Cavalier of Night
    Cavalier of Night
    and
    Altar of Dementia
    Altar of Dementia
    on the battlefield.

Steps

  1. Activate
    Altar of Dementia
    Altar of Dementia
    by sacrificing
    Cavalier of Night
    Cavalier of Night
    .
  2. When
    Cavalier of Night
    Cavalier of Night
    dies, it triggers, returning
    Activated Sleeper
    Activated Sleeper
    from your graveyard to the battlefield as a copy of
    Cavalier of Night
    Cavalier of Night
    .
  3. When
    Activated Sleeper
    Activated Sleeper
    enters the battlefield, its first triggered ability from
    Cavalier of Night
    Cavalier of Night
    triggers; choose not to sacrifice a creature.
  4. Resolve the
    Altar of Dementia
    Altar of Dementia
    ability from step 1.
  5. Activate
    Altar of Dementia
    Altar of Dementia
    by sacrificing
    Activated Sleeper
    Activated Sleeper
    .
  6. When
    Activated Sleeper
    Activated Sleeper
    dies, its last ability from
    Cavalier of Night
    Cavalier of Night
    triggers, returning itself from your graveyard to the battlefield as a copy of
    Cavalier of Night
    Cavalier of Night
    .
  7. When
    Activated Sleeper
    Activated Sleeper
    enters the battlefield, it triggers; choose not to sacrifice a creature.
  8. Resolve the
    Altar of Dementia
    Altar of Dementia
    ability from step 5.
  9. Repeat from step 5.

Results

  1. Infinite death triggers.
  2. Infinite ETB.
  3. Infinite LTB.
  4. Infinite mill.
  5. Infinite sacrifice triggers.
  6. Infinite self-mill.

Metadata

  1. In 142 decks according to EDHREC.
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