Metalwork Colossus, Slagstone Refinery, Sly Requisitioner, and Ashnod's Altar

Prerequisites

• Metalwork Colossus on the battlefield
• Slagstone Refinery on the battlefield
• Sly Requisitioner on the battlefield
• Ashnod's Altar on the battlefield
• Noncreature artifacts you control have a combined mana value of ten or greater

Steps

1. Activate Ashnod's Altar by sacrificing Metalwork Colossus, adding
2. When Metlwork Colossus dies, Sly Requisitioner and Slagstone Refinery trigger
3. Resolve the Sly Requisitioner trigger, creating a 1/1 Servo artifact creature token
4. Resolve the Slagstone Refinery trigger, creating a tapped Powerstone artifact token
5. Activate Metalwork Colossus by sacrificing the Servo and the Powerstone token, returning Metalwork Colossus from your graveyard to your hand
6. Cast Metalwork Colossus by paying at most
7. Repeat

Results

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