Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Intruder Alarm + Cavern Harpy
Infinite LTB, Infinite ETB, Infinite storm count, Infinite mana creatures you control can produce, Infinite untap of creatures, Infinite untap of creatures you control
Cast Cavern Harpy by paying its mana cost reduced by the number of creatures you can tap while casting it.
When Cavern Harpy enters, it and Intruder Alarm trigger.
Resolve the Cavern Harpy trigger, returning it from the battlefield to your hand.
Resolve the Intruder Alarm trigger, untapping all creatures.
Repeat.
Component Cards
How It Works
Cast Cavern Harpy by paying its mana cost reduced by the number of creatures you can tap while casting it.
When Cavern Harpy enters, it and Intruder Alarm trigger.
Resolve the Cavern Harpy trigger, returning it from the battlefield to your hand.
Resolve the Intruder Alarm trigger, untapping all creatures.
Repeat.