Sai, Master Thopterist + Myr Retriever + Junk Diver + Ashnod's Altar

Sai, Master Thopterist
Myr Retriever
Junk Diver
Ashnod's Altar

Requires
Myr Retriever in your graveyard. All other permanents on the battlefield.
Steps
  1. Activate Ashnod's Altar by sacrificing Junk Diver, adding cc
  2. Junk Diver dies, returning Myr Retriever from your graveyard to your hand
  3. Cast Myr Retriever by paying 2
  4. Sai triggers, creating a 1/1 Thopter artifact creature token
  5. Activate Ashnod's Altar twice by sacrificing the Thopter and Myr Retriever, adding cccc
  6. Myr Retriever dies, returning Junk Diver from your graveyard to your hand
  7. Cast Junk Diver by paying 3
  8. Sai triggers, creating a 1/1 Thopter 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.