Intruder Alarm, and Hushwing Gryff

Prerequisites

• Intruder Alarm on the battlefield
• Hushwing Gryff on the battlefield

Steps

1. Intruder Alarm's first ability prevents creatures from untapping during their controller's untap step
2. Because Hushwing Gryff prevents abilities from triggering whenever a creature enters the battlefield, Intruder Alarm's second ability does not trigger to untap them

Results

• Creatures do not untap during their controller's untap step