Soul Collector, Intruder Alarm, and Viridian Longbow

Prerequisites

• Soul Collector on the battlefield
• Intruder Alarm on the battlefield
• Viridian Longbow on the battlefield
• Viridian Longbow attached to Soul Collector
• Soul Collector does not have summoning sickness
• A player controls a nontoken creature with toughness equal to one

Steps

1. Activate Soul Collector by tapping it, dealing 1 damage to any nontoken creature with toughness equal to one
2. The creature dies as a state-based action due to having zero toughness, triggering Soul Collector, returning the creature from a graveyard onto the battlefield under your control
3. The creature enters the battlefield, triggering Intruder Alarm, untapping all creatures
4. Repeat

Results

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