Mirrodin Besieged + Myr Retriever + Junk Diver + Ashnod's Altar

Mirrodin Besieged
Myr Retriever
Junk Diver
Ashnod's Altar

Requires
Myr Retriever in your graveyard. All other permanents on the battlefield. "Mirran" chosen with Mirrodin Besieged.
Steps
  1. Activate Ashnod's Altar by sacrificing Junk Diver, adding cc
  2. When Junk Diver dies, it triggers, returning Myr Retriever from your graveyard to your hand
  3. Cast Myr Retriever by paying 2
  4. Mirrodin Besieged triggers, creating a 1/1 Myr artifact creature token
  5. Activate Ashnod's Altar twice by sacrificing the Myr and Myr Retriever, adding cccc
  6. When Myr Retriever dies, it triggers, returning Junk Diver from your graveyard to your hand
  7. Cast Junk Diver by paying 3
  8. Mirrodin Besieged triggers, creating a 1/1 Myr artifact creature token
  9. Repeat
Results
Infinite creature tokens. Infinite colorless mana. Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers. Infinite storm count.