Unctus, Grand Metatect, Slagstone Refinery, March of the Machines, Sword of the Meek, and Ashnod's Altar

Prerequisites

• Unctus, Grand Metatect on the battlefield
• Slagstone Refinery on the battlefield
• March of the Machines on the battlefield
• Sword of the Meek on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Sword of the Meek, adding
2. Sword of the Meek dies, triggering Slagstone Refinery, creating a tapped Powerstone token that enters the battlefield as a 1/1 creature due to March of the Machines and Unctus
3. Sword of the Meek triggers, returning itself from your graveyard to the battlefield, but not attaching itself to the Powerstone due to Sword of the Meek becoming a creature
4. Repeat

Results

• Infinite colorless mana
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite tapped creature tokens
• Infinite tapped Powerstone tokens