Xavier Sal, Infested Captain + Intruder Alarm + Arcbound Crusher

Xavier Sal, Infested Captain

Intruder Alarm

Arcbound Crusher

How it works

1. Activate Xavier Sal by tapping it and removing a counter from a permanent you control, creating a copy of an artifact creature token you control.
2. When the creature token enters the battlefield, Intruder Alarm and Arcbound Crusher trigger.
3. Resolve the Intruder Alarm trigger, untapping all creatures.
4. Resolve the Arcbound Crusher trigger, putting a counter on it.
5. Repeat.

This ingenious loop hinges on Xavier Sal, Infested Captain using its tap ability to populate an artifact creature token by removing a counter from any permanent you control. Because the token entering the battlefield triggers Intruder Alarm, every creature you control untaps—including Xavier Sal—allowing you to tap it right back down. Meanwhile, Arcbound Crusher happily grows larger with each new arrival as its triggered ability pumps it whenever another artifact enters, ensuring your board state scales infinitely.