Optimus Prime, Hero + Luminous Broodmoth + Phyrexian Altar

Optimus Prime, Hero
Luminous Broodmoth
Phyrexian Altar

Requires
Optimus Prime, Hero // Optimus Prime, Autobot Leader must be on the battlefield. Luminous Broodmoth must be on the battlefield. Phyrexian Altar must be on the battlefield. It is your turn.
Steps
  1. Activate Phyrexian Altar by sacrificing Optimus Prime, Hero, adding one mana of any color.
  2. When Optimus Prime, Hero dies, its second ability triggers, returning it from your graveyard to the battlefield as Optimus Prime, Autobot Leader.
  3. Activate Phyrexian Altar by sacrificing Optimus Prime, Autobot Leader, adding one mana of any color.
  4. When Optimus Prime, Autobot Leader dies, Luminous Broodmoth triggers, returning Optimus Prime from your graveyard to the battlefield as Optimus Prime, Hero with a flying counter on it.
  5. Repeat.
Results
Infinite LTB. Infinite ETB. Infinite colored mana. Infinite sacrifice triggers. Infinite death triggers.