Atsushi, the Blazing Sky, Nim Deathmantle, and Ashnod's Altar

Prerequisites

• Atsushi, the Blazing Sky on the battlefield
• Nim Deathmantle on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Atsushi, adding
2. Atsushi dies, triggering itself and Nim Deathmantle
3. Resolve the Atsushi trigger, creating three Treasure tokens
4. Activate two of the Treasure tokens by tapping and sacrificing them, adding
5. Resolve the Nim Deathmantle trigger, causing you to pay to return Atsushi from your graveyard to the battlefield, and then attach Nim Deathmantle to it
6. Repeat

Results

• Infinite colored mana
• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite Treasure tokens
• Play all nonland cards in your library