Color Identity: R

Prerequisites

  1.  
    Combat Celebrant
    Combat Celebrant     and
    Helm of the Host
    Helm of the Host     on the battlefield.
  2. Helm of the Host
    Helm of the Host     attached to
    Combat Celebrant
    Combat Celebrant    .

Steps

  1. At the beginning of your combat phase,
    Helm of the Host
    Helm of the Host     triggers, creating a token copy of
    Combat Celebrant
    Combat Celebrant     with haste.
  2. Declare the token
    Combat Celebrant
    Combat Celebrant     as an attacker choosing to exert it as it attacks.
  3. The
    Combat Celebrant
    Combat Celebrant     copy triggers, untapping all other creature you control and causing you to get an additional combat phase after this one.
  4. Repeat.

Results

  1. Infinite combat phases.
  2. Infinite ETB.
  3. Infinite tapped creature tokens.
  4. Infinite untap of creatures you control.

Metadata

  1. In 9260 decks according to EDHREC.
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