Colfenor, the Last Yew, Myr Retriever, Ashnod's Altar, and Su-Chi

Prerequisites

• Colfenor, the Last Yew on the battlefield
• Myr Retriever in the graveyard
• Ashnod's Altar on the battlefield
• Su-Chi on the battlefield

Steps

1. Activate Ashnod's Altar, sacrificing Su-Chi to add
2. Su-Chi and Colfenor trigger
3. Resolve the Su-Chi trigger, adding
4. Resolve the Colfenor trigger, returning Myr Retriever from your graveyard to your hand
5. Cast Myr Retriever
6. Activate Ashnod's Altar, sacrificing Myr Retriever to add
7. Myr Retriever triggers, returning Su-Chi from your graveyard to your hand
8. Cast Su-Chi
9. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers