Fallaji Wayfarer + Intruder Alarm + Cavern Harpy

Fallaji Wayfarer
Intruder Alarm
Cavern Harpy

Requires
Fallaji Wayfarer must be on the battlefield. Intruder Alarm must be on the battlefield. Cavern Harpy must be in hand. You control an additional blue or black creature.
Steps
  1. Cast Cavern Harpy by tapping Fallaji Wayfarer and a blue or black creature.
  2. Cavern Harpy enters the battlefield, triggering itself and Intruder Alarm.
  3. Resolve the Cavern Harpy trigger, returning it from the battlefield to your hand.
  4. Resolve the Intruder Alarm trigger, untapping all creatures.
  5. Repeat.
Results
Infinite ETB. Infinite LTB. Infinite mana creatures you control can produce. Infinite storm count. Infinite untap of all creatures.

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