Sai, Master Thopterist, Myr Retriever, Workshop Assistant, and Ashnod's Altar

Prerequisites

• Sai, Master Thopterist on the battlefield
• Myr Retriever in the graveyard
• Workshop Assistant on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Workshop Assistant, adding
2. Workshop Assistant dies, returning Myr Retriever from your graveyard to your hand
3. Cast Myr Retriever by paying
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
6. Myr Retriever dies, returning Workshop Assistant from your graveyard to your hand
7. Cast Workshop Assistant by paying
8. Sai triggers, creating a 1/1 Thopter artifact creature token
9. Repeat

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count