Color Identity: W, U, B, R

Prerequisites

  1.  
    Bloodthirster
    Bloodthirster
    in your graveyard.
  2.  
    Altaïr Ibn-La'Ahad
    Altaïr Ibn-La'Ahad
    and
    Leyline of Transformation
    Leyline of Transformation
    on the battlefield (
    Leyline of Transformation
    Leyline of Transformation
    with "Assassin" chosen).
  3. An opponent cannot block creatures you control.
  4. You have a way to give
    Altaïr Ibn-La'Ahad
    Altaïr Ibn-La'Ahad
    vigilance.

Steps

  1. Give
    Altaïr Ibn-La'Ahad
    Altaïr Ibn-La'Ahad
    vigilance by any method.
  2. Declare
    Altaïr Ibn-La'Ahad
    Altaïr Ibn-La'Ahad
    as an attacker.
  3. Altaïr Ibn-La'Ahad
    Altaïr Ibn-La'Ahad
    triggers, exiling
    Bloodthirster
    Bloodthirster
    from your graveyard with a memory counter on it as it is an Assassin due to
    Leyline of Transformation
    Leyline of Transformation
    , and then creating a tapped and attacking token copy of each creature you own in exile with a memory counter on it.
  4. Deal combat damage to an opponent using the
    Bloodthirster
    Bloodthirster
    token.
  5. The
    Bloodthirster
    Bloodthirster
    token triggers, causing you to untap it and to get an additional combat phase after this one.
  6. At the end of your combat phase,
    Altaïr Ibn-La'Ahad
    Altaïr Ibn-La'Ahad
    triggers, exiling the
    Bloodthirster
    Bloodthirster
    token.
  7. Move to your next combat phase, and declare
    Altaïr Ibn-La'Ahad
    Altaïr Ibn-La'Ahad
    as an attacker.
  8. Altaïr Ibn-La'Ahad
    Altaïr Ibn-La'Ahad
    triggers, creating a tapped and attacking token copy of each creature you own in exile with a memory counter on it.
  9. Repeat from step 4.

Results

  1. Infinite LTB.
  2. Infinite ETB.
  3. Infinite combat phases.
  4. Infinite combat damage.

Metadata

  1. In 0 decks according to EDHREC.
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