Enduring Renewal, Cathodion, and Phyrexian Altar

Prerequisites

• Enduring Renewal on the battlefield
• Cathodion on the battlefield
• Phyrexian Altar on the battlefield
• You have seven or more cards in your graveyard

Steps

1. Activate Phyrexian Altar by sacrificing Cathodion, adding one mana of any color
2. Cathodion dies, triggering itself and Enduring Renewal
3. Resolve the Cathodion trigger, adding
4. Resolve the Enduring Renewal trigger, causing you to return Cathodion from your graveyard to your hand
5. Cast Cathodion by paying
6. Repeat

Results

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