Intruder Alarm
Enchantment
Creatures don't untap during their controllers' untap steps.
Whenever a creature enters, untap all creatures.
One footstep among many is silent. One footstep alone is deafening.
Illustrated by
The List#8ED-86RareEnglishLegality
Rulings
Oct 4, 2004
If multiple creatures enter the battlefield at one time, this ability triggers once for each creature. This doesn’t matter much, but it can in some cases.