Hullbreaker Horror + Intruder Alarm

Hullbreaker Horror

Intruder Alarm

How it works

1. Activate any number of creatures you control by tapping them, adding an amount of mana.
2. Cast the creature from your hand by paying its mana cost.
3. Hullbreaker Horror triggers, returning another creature from the battlefield to your hand.
4. Resolve the creature spell. When it enters, Intruder Alarm triggers, untapping all creatures.
5. Repeat.

This clever loop turns the table's own creatures into a self-sustaining engine by exploiting Hullbreaker Horror's ability to bounce a nonland permanent whenever you cast a spell. As you tap your mana-producing creatures for resources, casting a creature from your hand triggers the Horror to safely return another creature to your hand while simultaneously satisfying Intruder Alarm's trigger upon entry. That same creature entry untaps all your creatures thanks to Intruder Alarm, letting you recast the bounced creature to repeat the process indefinitely for infinite mana, triggers, and storm count.