Mirrorworks + Ashnod's Altar + Myr Retriever

Mirrorworks
Ashnod's Altar
Myr Retriever

Requires
Myr Retriever in hand. All other permanents on the battlefield. 2 available.
Steps
  1. Cast Myr Retriever
  2. Mirrorworks triggers
  3. In response to the trigger, sacrifice Myr Retriever to Ashnod's Altar, adding cc
  4. Resolve the Myr Retriever death trigger with no targets
  5. Pay for Mirrorworks' trigger, creating a token copy of Myr Retriever
  6. Sacrifice the token copy of Myr Retriever to Ashnod's Altar, adding cc
  7. The token copy of Myr Retriever triggers, returning Myr Retriever from your graveyard to your hand
  8. Repeat
Results
Infinite sacrifice triggers. Infinite ETB. Infinite LTB. Infinite death triggers. Infinite storm count.