Enduring Renewal, Phyrexian Altar, and Intruder Alarm

Prerequisites

• Enduring Renewal on the battlefield
• Phyrexian Altar on the battlefield
• Intruder Alarm on the battlefield
• You have at least one creature card in hand
• Creatures you control can tap to produce enough mana to cast the creature card minus one colored mana
• You are able to cast the creature card in hand

Steps

1. Activate all mana-producing creatures you control by tapping them, adding at least
2. Cast the creature card by paying its mana cost
3. When the creature enters the battlefield, Intruder Alarm triggers, untapping all creatures
4. Activate Phyrexian Altar by sacrificing the creature, adding one mana of any color
5. When the creature dies, Enduring Renewal triggers, returning the creature to your hand from your graveyard
6. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite sacrifice triggers
• Infinite storm count
• Infinite untap of all creatures