Color Identity: W, U, B, R

Prerequisites

  1.  All permanents on the battlefield.
  2. An opponent cannot block creatures you control.

Steps

  1. Declare
    Altaïr Ibn-La'Ahad
    Altaïr Ibn-La'Ahad
    as an attacker.
  2. Altaïr Ibn-La'Ahad
    Altaïr Ibn-La'Ahad
    triggers, exiling
    Medomai the Ageless
    Medomai the Ageless
    from your graveyard with a memory counter on it as it is an Assassin due to
    Roshan, Hidden Magister
    Roshan
    , and then creating a tapped and attacking token copy of each creature you own in exile with a memory counter on it.
  3. Deal combat damage to an opponent using the
    Medomai the Ageless
    Medomai the Ageless
    token.
  4. The
    Medomai the Ageless
    Medomai the Ageless
    token triggers, causing you to take an extra turn after this one.
  5. At the end of your combat phase,
    Altaïr Ibn-La'Ahad
    Altaïr Ibn-La'Ahad
    triggers, exiling the
    Medomai the Ageless
    Medomai the Ageless
    token.
  6. During the combat phase of your extra turn, declare
    Altaïr Ibn-La'Ahad
    Altaïr Ibn-La'Ahad
    as an attacker.
  7. 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.
  8. Repeat from step 3.

Results

  1. Infinite extra turns.

Metadata

  1. In 0 decks according to EDHREC.
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