Cavalier of Night + Mirror Image + Ashnod's Altar

Cavalier of Night
Mirror Image
Ashnod's Altar

Requires
Cavalier of Night must be on the battlefield. Mirror Image must be on the battlefield (as a copy of Cavalier of Night). Ashnod's Altar must be on the battlefield.
Steps
  1. Activate Ashnod's Altar by sacrificing Mirror Image, adding .
  2. When Mirror Image dies, its last ability from Cavalier of Night triggers, returning itself from your graveyard to the battlefield as a copy of Cavalier of Night.
  3. When Mirror Image enters the battlefield, its first triggered ability from Cavalier of Night triggers; choose not to sacrifice a creature.
  4. Repeat.
Results
Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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