How can you create a combo with Sai, Master Thopterist, Myr Retriever, Workshop Assistant, Phyrexian Altar, Foundry Inspector?
user
[START OF COMBO]This combo can be formed with Sai, Master Thopterist, Myr Retriever, Workshop Assistant, Phyrexian Altar, Foundry Inspector

Color identity: U
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing Workshop Assistant, adding {1}.
  2. Workshop Assistant dies, returning Myr Retriever from your graveyard to your hand.
  3. Cast Myr Retriever by paying {1}.
  4. Sai triggers, creating a 1/1 Thopter artifact creature token.
  5. Activate Phyrexian Altar twice by sacrificing the Thopter and Myr Retriever, adding {2}.
  6. Myr Retriever dies, returning Workshop Assistant from your graveyard to your hand.
  7. Cast Workshop Assistant by paying {2}.
  8. Sai triggers, creating a 1/1 Thopter artifact creature token.
  9. Repeat.
  10. Once you have infinite colored mana and creature tokens, you may use them to activate Sai's ability to draw infinite cards.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite colored mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite draw triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Sai, Master Thopterist must be on the battlefield
  - Myr Retriever must be in the graveyard
  - Workshop Assistant must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - Foundry Inspector must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant